Concave downward graph - Concave downward, downward, is an interval, or you're gonna be concave downward over an interval when your slope is decreasing. So g prime of x is decreasing or we can say …

 
This video defines concavity using the simple idea of cave up and cave down, and then moves towards the definition using tangents. You can find part 2 here, .... Justamibx

1) that the concavity changes and 2) that the function is defined at the point. You can think of potential inflection points as critical points for the first derivative — i.e. they may occur if f"(x) = 0 OR if f"(x) is undefined. An example of the latter situation is f(x) = x^(1/3) at x=0. (Note: f'(x) is also undefined.) Relevant links:Databases run the world, but database products are often some of the most mature and venerable software in the modern tech stack. Designers will pixel push, frontend engineers will...1) that the concavity changes and 2) that the function is defined at the point. You can think of potential inflection points as critical points for the first derivative — i.e. they may occur if f"(x) = 0 OR if f"(x) is undefined. An example of the latter situation is f(x) = x^(1/3) at x=0. (Note: f'(x) is also undefined.) Relevant links:Calculus questions and answers. Identify the open intervals on which the graph of the function is concave upward or concave downward. Assume that the graph extends past what is shown. Note Use the letter U for union. To enter ∞, type infinity Enter your answers to the nearest integer If the function is never concave upward or concave downward ...The graph of y=f (x) is concave down when the derivative f’ (x) is decreasing or equivalently when the second derivative f” (x)<0. In this case f (x)=- (5/x)-2 so f’ (x)=5/x^2 and f” (x)=-10/x^3 and hence f” (x)<0 if and only if x<0. Answer: x < 0. Still looking for help? Find the inflection points and intervals of concavity up and down of f(x) = 2x3 − 12x2 + 4x − 27. Solution: First, the second derivative is f ″ (x) = 12x − 24. Thus, solving 12x − 24 = 0, there is just the one inflection point, 2. Choose auxiliary points to = 0 to the left of the inflection point and t1 = 3 to the right of the ... For a quadratic function f (x)=ax^2+bx+c, if a>0, then f is concave upward everywhere, if a<0, then f is concave downward everywhere. Wataru · 6 · Sep 21 2014.Jun 12, 2020 ... Determine the Open t-intervals where the Graph is Concave up or Down: x = sin(t), y = cos(t) If you enjoyed this video please consider ...The graph of a concave function is a curve that is bowed downward, and it looks like a frown. For example, the function f(x) = -x^2 is a concave function because its second derivative is -2, which is negative.Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 2 x − 3 tan x r (− 2 x 2 π ) concave upward concave downward LARCALC11 3.4.016. Determine the open intervals on which the graph is concave upward or …is concave upward or downward. Let f be a function whose second derivative exists on an open interval I. Test For Concavity: 1. If f''(x) > 0 for all x in I, then the graph of f is concave upward on I. 2. If f''(x) < 0 for all x in I, then the graph of f is concave downward on I.State the first derivative test for critical points. Use concavity and inflection points to explain how the sign of the second derivative affects the shape of a function’s graph. Explain the concavity test for a function over an open interval. Explain the relationship between a function and its first and second derivatives.If the second derivative is positive at a point, the graph is bending upwards at that point. Similarly, if the second derivative is negative, the graph is concave down. This is of particular interest at a critical point where the tangent line is flat and concavity tells us if we have a relative minimum or maximum. 🔗.Also, g00(x) <0 when xis in (1 ; p 3) or (0; p 3), and g00(x) >0 when xis in (0) p 3; Lecture 10: Concavity 10-4 or ( p 3;1). Hence the graph of g is concave downward on (1 ; p 3) and …Question: You are given the graph of a function f. The x y-coordinate plane is given. The curve enters the window in the second quadrant nearly horizontal, goes down and right becoming more steep, is nearly vertical at the point (0, 1), goes down and right becoming less steep, crosses the x-axis at approximately x = 1, and exits the window just below theExcel is a powerful tool that allows users to organize and analyze data in various ways. One of the most popular features of Excel is its ability to create graphs and charts. Graph...Recall the concavity test. - If g ′′ (x) > 0 on an interval I, then the graph of g is concave upward on I. - If g ′′ (x) < 0 on an interval I, then the graph of g is concave downward on I. Therefore, in order to determine concavity we must first find g ′′ (x). Since g ′ (x) = 24 x 2 + 4 x 3, then g ′′ (x) =Identify the open intervals on which the graph of the function is concave upward or concave downward. Assume that the graph extends past what is shown 10 18- 6 4- 10 La 6 -4 -2- -4- 1 Nole. Use the letter Ufor union. To enter type infinity Enter your answers to the nearest integer If the function is never concave upward or concave downward ... The concavity of the graph of a function refers to the curvature of the graph over an interval; this curvature is described as being concave up or concave down. Generally, a concave up curve has a shape resembling "∪" and a concave down curve has a shape resembling "∩" as shown in the figure below. How to find the concavity of a function. “concave” or “convex down” used to mean “concave down”. To avoid confusion we recommend the reader stick with the terms “concave up” and “concave down”. Let's now continue Example 3.6.2 by discussing the concavity of the curve.State the first derivative test for critical points. Use concavity and inflection points to explain how the sign of the second derivative affects the shape of a function’s graph. Explain the concavity test for a function over an open interval. Explain the relationship between a function and its first and second derivatives.A section that is concave down is defined as an interval on the graph where such a line will be below the graph. The segment line in green is concave down. The segment line in blue is concave up.Second Derivative and Concavity. Graphically, a function is concave up if its graph is curved with the opening upward (Figure \(\PageIndex{1a}\)). Similarly, a function is concave down if its graph opens downward (Figure \(\PageIndex{1b}\)).. Figure \(\PageIndex{1}\) This figure shows the concavity of a function at several points.Nov 18, 2022 · A Concave function is also called a Concave downward graph. Intuitively, the Concavity of the function means the direction in which the function opens, concavity describes the state or the quality of a Concave function. For example, if the function opens upwards it is called concave up and if it opens downwards it is called concave down. When the second derivative is negative, the function is concave downward. And the inflection point is where it goes from concave upward to concave downward (or vice versa). And 30x + 4 is negative up to x = −4/30 = −2/15, positive from there onwards. So: f (x) is concave downward up to x = −2/15. f (x) is concave upward from x = −2/15 on. The concavity of the graph of a function refers to the curvature of the graph over an interval; this curvature is described as being concave up or concave down. Generally, a concave up curve has a shape resembling "∪" and a concave down curve has a shape resembling "∩" as shown in the figure below. How to find the concavity of a function. The concavity of the graph of a function refers to the curvature of the graph over an interval; this curvature is described as being concave up or concave down. Generally, a concave up curve has a shape resembling "∪" and a concave down curve has a shape resembling "∩" as shown in the figure below. How to find the concavity of a function. In this section, we also see how the second derivative provides information about the shape of a graph by describing whether the graph of a function curves upward or curves downward. Increasing/Decreasing FunctionsAre you looking to present your data in a visually appealing and easy-to-understand format? Look no further than creating a bar graph in Excel. A bar graph is a powerful tool for v...If f′(a) > 0 f ′ ( a) > 0, this means that f f slopes up and is getting steeper; if f′(a) < 0 f ′ ( a) < 0, this means that f f slopes down and is getting less steep.Step 1. The question is based on plot of graph. Select the graph which satisfies all of the given conditions. Justify your answer in terms of derivatives and concavity information below. You should explain why the graph you chose is correct as opposed to a solution by eliminating options. Specifically, your explanation should be a guide for how ...See full list on tutorial.math.lamar.edu Google Spreadsheets is a powerful tool that can help you organize and analyze data effectively. One of its most useful features is the ability to create interactive charts and grap...Free Functions Concavity Calculator - find function concavity intervlas step-by-step Calculus. Find the Concavity f (x)=x^3-12x+3. f (x) = x3 − 12x + 3 f ( x) = x 3 - 12 x + 3. Find the x x values where the second derivative is equal to 0 0. Tap for more steps... x = 0 x = 0. The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the ... function is concave upward on ( − 1, 1) Identify the open intervals on which the graph of the function is concave upward or concave downward. Assume that the graph extends past what is shown. Note: Use the letter U for union. To enter ∞, type infinity. Enter your answers to the nearest integer. If the function is never concave upward or ...The graph of a function \(f\) is concave down when \(f'\) is decreasing. That means as one looks at a concave down graph from left to right, the slopes of the tangent lines will be decreasing. Consider Figure \(\PageIndex{2}\), where a concave down graph is shown along with some tangent lines.Sep 13, 2020 ... Comments11 · Sketch the Graph the Function using Information about the First and Second Derivatives · Concavity, Inflection Points, Increasing .... Concave up (also called convex) or concave down are descriptions for a graph, or part of a graph: A concave up graph looks roughly like the letter U. A concave down graph is shaped like an upside down U (“⋒”). They tell us something about the shape of a graph, or more specifically, how it bends. That kind of information is useful when it ... The graph is concave down when the second derivative is negative and concave up when the second derivative is positive. Concave down on since is negative. Concave up on since is positive. Concave down on since is negative. Concave up on since is positive. Step 9Looking for a deal on a vehicle? Used cars are going down in price. A recent report reveals vehicles with the biggest price decreases. After a pandemic-fueled spike in prices, what...The graph of f (blue) and f'' (red) are shown below. It can easily be seen that whenever f'' is negative (its graph is below the x-axis), the graph of f is concave down and whenever f'' is positive (its graph is above the x-axis) the graph of f is concave up. Point (0,0) is a point of inflection where the concavity changes from up to down as x ... The concavity of a function/graph is an important property pertaining to the second derivative of the function. In particular: If 0">f′′(x)>0, the graph is concave up (or convex) at that value of x. If f′′(x)<0, the graph is concave down (or just concave) at that value of x. If a is negative then the graph of f is concave down. Below are some examples with detailed solutions. Example 1 What is the concavity of the following quadratic function? f(x) = (2 - x)(x - 3) + 3 Solution to Example 1 Expand f(x) and rewrite it as follows f(x) = -x 2 + 5x -3 The leading coefficient a is negative and therefore the graph of is ...Step 1. In Exercises 5 through 20, determine where the given function is increasing and decreasing and where its graph is concave upward and concave downward. Sketch the graph of the function. Show as many key features as possible (high and low points, points of inflection, vertical and horizontal asymptotes, intercepts, cusps, vertical tangents). Calculus. Find the Concavity f (x)=x^3-12x+3. f (x) = x3 − 12x + 3 f ( x) = x 3 - 12 x + 3. Find the x x values where the second derivative is equal to 0 0. Tap for more steps... x = 0 x = 0. The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the ... The First Derivative Test. Corollary 3 of the Mean Value Theorem showed that if the derivative of a function is positive over an interval I then the function is increasing over I. On the other hand, if the derivative of the … When f''(x) \textcolor{red}{< 0}, we have a portion of the graph where the gradient is decreasing, so the graph is concave at this section. An easy way to test for both is to connect two points on the curve with a straight line. If the line is above the curve, the graph is convex. If the line is below the curve, the graph is concave. This graph determines the concavity and inflection points for any function equal to f(x). Green = concave up, red = concave down, blue bar = inflection point. 1In this section, we also see how the second derivative provides information about the shape of a graph by describing whether the graph of a function curves upward or curves downward. Increasing/Decreasing FunctionsLecture 10: Concavity. 10.1 Concave upward and concave downward Example Note that both f(x) = x2and g(x) = xpare increasing on the interval [0;1), but their graphs look signi cantly di erent. This is explained by the fact that f0(x) = 2x, and so is an increasing function on [0;1), whereas g0(x) =2 1 p x. , and so is a decreasing function on (0;1).Consider the following graph. Step 1 of 2: Determine the intervals on which the function is concave upward and concave downward. Enable Zoom/Pan < rev -10 -5 75 . * Consider the following graph. Step 2 of 2: Determine the x-coordinates of any inflection point (s) in the graph. 15% -10 awkes Learning -5 -7.5 Enable Zoom/Pan 5 6 K 10 X Suppose ...Solution. For problems 3 – 8 answer each of the following. Determine a list of possible inflection points for the function. Determine the intervals on which the function is concave up and concave down. Determine the inflection points of the function. f (x) = 12+6x2 −x3 f ( x) = 12 + 6 x 2 − x 3 Solution. g(z) = z4 −12z3+84z+4 g ( z) = z ...Similarly, a function is concave down if its graph opens downward (Figure 2.6.1b ). Figure 2.6.1. This figure shows the concavity of a function at several points. Notice that a function can be concave up regardless of whether it is increasing or decreasing.Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) f (x) = − x 3 + 6 x 2 − 7 x − 1 concave upward concave downwardTheorem. Let f ″ be the second derivative of function f on a given interval I, the graph of f is. (i) concave up on I if f ″ (x) > 0 on the interval I . (ii) concave down on I if f ″ (x) < 0 on …Similarly, a function is concave down if its graph opens downward (Figure \(\PageIndex{1b}\)). Figure \(\PageIndex{1}\) This figure shows the concavity of a function at several points. Notice that a function can be concave up regardless of whether it is increasing or decreasing. Our expert help has broken down your problem into an easy-to-learn solution you can count on. See Answer See Answer See Answer done loading Question: Use the given graph of the derivative f' of a continuous function f over the interval (0,9) to find the following. y = f'(x (a) on what interval(s) is f increasing? The graph of f (blue) and f'' (red) are shown below. It can easily be seen that whenever f'' is negative (its graph is below the x-axis), the graph of f is concave down and whenever f'' is positive (its graph is above the x-axis) the graph of f is concave up. Point (0,0) is a point of inflection where the concavity changes from up to down as x ... Calculus. Calculus questions and answers. Find the intervals on which the graph of f is concave upward, the intervals on which the graph of f is concave downward, and the inflection points f (x) = x^18 + 9x^2 For what interval (s) of x is the graph of f concave upward? Select the correct choice below and. if necessary, fill in the answer box to ...This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: What are all values of x for which the graph of y=4−x2 is concave downward? (A) No values of x (B) x<4 (C) x>−4 (D) x<−4 (E) x>4. There are 2 steps to solve this one.The Second Derivative Test relates the concepts of critical points, extreme values, and concavity to give a very useful tool for determining whether a critical point on the graph of a function is a relative minimum or maximum. The Second Derivative Test: Suppose that c c is a critical point at which f′(c) = 0 f ′ ( c) = 0, that f′(x) f ...👉 Learn how to determine the extrema, the intervals of increasing/decreasing, and the concavity of a function from its graph. The extrema of a function are ...In Exercises 5 through 12, determine where the graph of the given function is concave upward and concave downward. Find the coordinates of all inflection points. 5. f (x) = x 3 + 3 x 2 + x + 1 In Exercises 13 through 26, determine where the given function is increasing and decreasing, and where its graph is concave up and concave down. Find the ...Find the intervals on which the graph of f is concave upward, the intervals on which the graph of f is concave downward and the inflection points. f (x) = ln (x 2 − 4 x + 29) For what interval(s) of x is the graph of f concave upward? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. A graph plots investment goods versus consumer goods. The graph is a concave downward curve.The horizontal axis is labeled consumer goods. It ranges from 0 to 4 in increments of 1. The vertical axis is labeled investment goods. It ranges from 0 to 10 in increments of 1. The graph is a concave downward curve that begins (0, 10). The demand curve for a monopolist slopes downward because the market demand curve, which is downward sloping, applies to the monopolist’s market activity. Demand for the monopolist...You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Determine the open intervals on which the graph of the function is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 3x + 5 sin (x) , (−𝜋, 𝜋) Determine the ...Transcribed image text: Use the given graph of f over the interval (0, 6) to find the following. 0 1 (a) The open intervals on which f is increasing. (Enter your answer using interval notation.) 1,3 (b) The open intervals on which f is decreasing. (Enter your answer using interval notation.) (c) The open intervals on which f is concave upward.Nov 21, 2023 · On the graph, the concave up section is outlined in red and it starts with a downward slope and looks like a large "U." f(x) = x^3 - x Make sure to check to see if the characteristics of a concave ... A downwards parabola, also known as a concave-down parabola, is a type of graph that represents a quadratic equation in the form of y = ax^2 + bx + c, where “a” is a negative constant. The graph of a downwards parabola opens downwards, forming a U-shaped curve. The vertex of a downwards parabola represents the lowest point on the graph ... Question: Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 5x - 7 tan x, (-) concave upward concave downward X Determine whether Rolle's Theorem can be applied to fon the closed interval [a, b].The x-axis is unnumbered. The graph consists of a curve. The curve starts in quadrant 3, moves upward, or is increasing, concave down to a relative max in quadrant 2, moves downward, or is decreasing, concave down until a point in quadrant 4 and then moves downward concave up to a point in quadrant 4, moves upward concave up, and ends in ...Feb 1, 2024 · Use a number line to test the sign of the second derivative at various intervals. A positive f ” ( x) indicates the function is concave up; the graph lies above any drawn tangent lines, and the slope of these lines increases with successive increments. A negative f ” ( x) tells me the function is concave down; in this case, the curve lies ... Similarly, a function is concave down if its graph opens downward (Figure 2.6.1b ). Figure 2.6.1. This figure shows the concavity of a function at several points. Notice that a function can be concave up regardless of whether it is increasing or decreasing. In this section, we also see how the second derivative provides information about the shape of a graph by describing whether the graph of a function curves upward or curves downward. Increasing/Decreasing Functions The graph of y=f (x) is concave down when the derivative f’ (x) is decreasing or equivalently when the second derivative f” (x)<0. In this case f (x)=- (5/x)-2 so f’ (x)=5/x^2 and f” (x)=-10/x^3 and hence f” (x)<0 if and only if x<0. Answer: x < 0. Still looking for help?Vertex of a Parabola Given a quadratic function \(f(x) = ax^2+bx+c\), depending on the sign of the \(x^2\) coefficient, \(a\), its parabola has either a minimum or a maximum point: . if \(a>0\): it has a maximum point ; if \(a<0\): it has a minimum point ; in either case the point (maximum, or minimum) is known as a vertex.. Finding the VertexIn terms of the second derivative, we can summarize our earlier discussion as follows. The graph of y = f ( x) is concave upward on those intervals where y = f " ( x ) > 0. The graph of y = f ( x) is concave downward on those intervals where y = f " ( x ) < 0. If the graph of y = f ( x) has a point of inflection then y = f " ( x) = 0.Then "slide" between a and b using a value t (which is from 0 to 1): x = ta + (1−t)b. When t=0 we get x = 0a+1b = b. When t=1 we get x = 1a+0b = a. When t is between 0 and 1 we get values between a and b. Now work out the heights at that x-value: When x = ta + (1−t)b: The curve is at y = f ( ta + (1−t)b ) When f''(x) \textcolor{red}{< 0}, we have a portion of the graph where the gradient is decreasing, so the graph is concave at this section. An easy way to test for both is to connect two points on the curve with a straight line. If the line is above the curve, the graph is convex. If the line is below the curve, the graph is concave. Example 3.5.1: curve sketching. Use Key Idea 4 to sketch f(x) = 3x3 − 10x2 + 7x + 5. Solution. The domain of f is the entire real line; there are no values x for which f(x) is not defined. Find the critical values of f. We compute f ′ (x) = 9x2 − 20x + 7. Use the Quadratic Formula to find the roots of f ′:The slope of a velocity graph represents the acceleration of the object. So, the value of the slope at a particular time represents the acceleration of the object at that instant. The slope of a velocity graph will be given by the following formula: slope = rise run = v 2 − v 1 t 2 − t 1 = Δ v Δ t. v ( m / s) t ( s) r i s e r u n t 1 t 2 ...

On graph A, if you draw a tangent any where, the entire curve will lie above this tangent. Such a curve is called a concave upwards curve. For graph B, the entire curve will lie below any tangent drawn to itself. Such a curve is called a concave downwards curve. The concavity’s nature can of course be restricted to particular intervals.. Nbcnews anchors

concave downward graph

Question. Determine where the given function is increasing and decreasing and where its graph is concave upward and concave downward. Sketch the graph of the function. Show as many key features as possible (high and low points, points of inflection, vertical and horizontal asymptotes, intercepts, cusps, vertical tangents). f (x)=x e^x f (x) = xex. If the second derivative is positive at a point, the graph is bending upwards at that point. Similarly, if the second derivative is negative, the graph is concave down. This is of particular interest at a critical point where the tangent line is flat and concavity tells us if we have a relative minimum or maximum. 🔗. See full list on tutorial.math.lamar.edu Math. Calculus. Calculus questions and answers. Identify the open intervals on which the graph of the function is concave upward or concave downward. Assume that the graph extends past what is shown. Note: Use the letter U for union. To enter ∞, type infinity. Enter your answers to the nearest integer. If the function is never concave upward ...The key features of this section are applying language and notation to the slope of a graph AND to the slope-of-the-slope of a graph. When it comes to the slope of a graph, we are most interested in where the slope is positive, negative, or zero. These slopes indicate that the graph is increasing, decreasing, or neither.Question: Let f (x) = x loga x The graph of f is concave upward on the interval (0, ») if the base a is in the interval , U (s, o, r o») (r, s) O [r, s] O None The graph of f is concave downward on (0, o) if the base a is in the interval (-«o, t) …Question: Find the intervals on which the graph of f is concave upward, the intervals on which the graph off is concave downward, and the inflection points. f(x) = x3 – 27x² + 7x + 5 For what interval(s) of x is the graph of f concave upward? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A.Sep 13, 2020 ... Intervals Where Function is Concave Up and Concave Down Polynomial Example If you enjoyed this video please consider liking, sharing, ...You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Determine the open intervals on which the graph of the function is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 3x + 5 sin (x) , (−𝜋, 𝜋) Determine the ... 2. I'm looking for a concave down increasing -function, see the image in the right lower corner. Basically I need a function f(x) which will rise slower as x is increasing. The x will be in range of [0.10 .. 10], so f(2x) < 2*f(x) is true. Also if. I would also like to have some constants which can change the way/speed the function is concaving. Possible Answers: Correct answer: Explanation: The intervals where a function is concave up or down is found by taking second derivative of the function. Use the power rule which states: Now, set equal to to find the point (s) of infleciton. In this case, . To find the concave up region, find where is positive.Anyway here is how to find concavity without calculus. Step 1: Given f (x), find f (a), f (b), f (c), for x= a, b and c, where a < c < b. Where a and b are the points of interest. C is just any convenient point in between them. Step 2: Find the equation of the line that connects the points found for a and b.The key features of this section are applying language and notation to the slope of a graph AND to the slope-of-the-slope of a graph. When it comes to the slope of a graph, we are most interested in where the slope is positive, negative, or zero. These slopes indicate that the graph is increasing, decreasing, or neither.Our expert help has broken down your problem into an easy-to-learn solution you can count on. Question: Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) y = 4x − 2 tan x, − π 2 , π 2. Determine the open intervals on ...1. Find the intervals on which the graph of f is concave upward, the intervals on which the graph of f is concave downward, and the inflection points. f(x)= -x^4 + 12x^3 - 12x + 19 For what interval(s) of x is the graph of f concave upward? 2. For the function f(x)= (8x-7)^5 a. The interval(s) for which f(x) is concave up. b.1) that the concavity changes and 2) that the function is defined at the point. You can think of potential inflection points as critical points for the first derivative — i.e. they may occur if f"(x) = 0 OR if f"(x) is undefined. An example of the latter situation is f(x) = x^(1/3) at x=0. (Note: f'(x) is also undefined.) Relevant links:The graph of y=f (x) is concave down when the derivative f’ (x) is decreasing or equivalently when the second derivative f” (x)<0. In this case f (x)=- (5/x)-2 so f’ (x)=5/x^2 and f” (x)=-10/x^3 and hence f” (x)<0 if and only if x<0. Answer: x < 0. Still looking for help?.

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