Slide 1

Chapter 2

Applications of the DerivativeDescribing Graphs of FunctionsThe First and Second Derivative RulesThe First and Second Derivative Tests and Curve SketchingCurve Sketching (Conclusion)Optimization ProblemsChapter OutlineIncreasing Functions

3Decreasing Functions

4Relative (Local) Maxima & Minima

5Absolute (Global) Maxima & Minima

6Concavity

Concave UpConcave Down

7Inflection Points

Notice that an inflection point is not where a graph changes from an increasing to a decreasing slope, but where the graph changes its concavity.8InterceptsDefinitionDefinitionx-Intercept: A point at which a graph crosses the x-axis.y-Intercept: A point at which a graph crosses the y-axis.

9AsymptotesDefinitionDefinitionHorizontal Asymptotes: A straight, horizontal line that a graph follows indefinitely as x increases without bound.Vertical Asymptotes: A straight, vertical line that a graph follows indefinitely as y increases without bound.Horizontal asymptotes occur when exists, in which case the asymptote is: If a function is undefined at x = a, a vertical asymptote occurs when a denominator equals zero, in which case the asymptote is:x = a.

10Limits as x Increases Without BoundEXAMPLESOLUTIONCalculate the following limits:

6-Point Graph Description

12Describing GraphsEXAMPLESOLUTIONUse the 6 categories previously mentioned to describe the graph.1) The function is increasing over the intervals The function is decreasing over the intervals Local (Relative) maxima are at x = 1 and at x = 5.5. Local (Relative) minima is at x = 3 and at x = 3.

Describing Graphs2) The function has a (absolute) maximum value at x = 1. The function has a (absolute) minimum value at x = 3.CONTINUED3) The function is concave up over the interval The function is concave down over the interval This function has exactly one inflection point, located at x = 1.

4) The function has three x-intercepts, located at x = 2.5, x = 1.25, and x = 4.5. The function has one y-intercept at y = 3.5.5) Over the functions domain, , the function is not undefined for any value of x.6) The function does not appear to have any asymptotes, horizontal or vertical.

First Derivative Rule

15First Derivative RuleEXAMPLESOLUTIONSketch the graph of a function that has the properties described.The only specific point that the graph must pass through is ( 1, 0). Further, we know that to the left of this point, the graph must be decreasing ( for x < 1) and to the right of this point, the graph must be increasing ( for x > 1). Lastly, the graph must have zero slope at that given point ( ).f ( 1) = 0; for x < 1; for x > 1.

Second Derivative Rule

17First & Second Derivative Scenarios

18First & Second Derivative RulesEXAMPLESOLUTIONSketch the graph of a function that has the properties described.The only specific points that the graph must pass through are (0, 0) and (5, 6). Further, we know that to the left of (5, 6), the graph must be concave down ( for x < 5) and to the right of this point, the graph must be concave up ( for x > 5). Also, the graph will only be defined in the first and fourth quadrants (x 0). Lastly, the graph must have positive slope everywhere that it is defined.f (x) defined only for x 0; (0, 0) and (5, 6) are on the graph; for x 0; for x < 5, , for x > 5.

First & Second Derivative Rules

CONTINUEDFirst & Second Derivative RulesEXAMPLELooking at the graphs of and for x close to 10, explain why the graph of f (x) has a relative minimum at x = 10.

At x = 10 the first derivative has a value of 0. Therefore, the slope of f (x) at x = 10 is 0. This suggests that either a relative minimum or relative maximum exists on the function f (x) at x = 10. To determine which it is, we will look at the second derivative. At x = 10, the second derivative is above the x-axis, suggesting that the second derivative is positive when x = 10. Therefore, f (x) is concave up when x = 10. Since at x = 10, f (x) has slope 0 and is concave up, this means that the f (x) has a relative minimum at x = 10.SOLUTIONFirst & Second Derivative RulesEXAMPLEAfter a drug is taken orally, the amount of the drug in the bloodstream after t hours is f (t) units. The figure below shows partial graphs of the first and second derivatives of the function.

(a) Is the amount of the drug in the bloodstream increasing or decreasing at t = 5?(b) Is the graph of f (t) concave up or concave down at t = 5?(c) When is the level of the drug in the bloodstream decreasing the fastest?First & Second Derivative RulesSOLUTION(a) To determine whether the amount of the drug in the bloodstream is increasing or decreasing at t = 5, we will need to consider the graph of the first derivative since the first derivative of a function tells how the function is increasing or decreasing.At t = 5 the value of the first derivative is 4. Therefore, the value of the first derivative is negative at t = 5. Therefore, the function is decreasing at t = 5.(b) To determine whether the graph of f (t) is concave up or concave down at t = 5, we will need to consider the graph of the second derivative at t = 5. At t = 5, the value of the second derivative is 0.5. Therefore, the value of the second derivative is positive at t = 5. Therefore, the function is concave up at t = 5.(c) To determine when the level of the drug in the bloodstream is decreasing the fastest, we need to determine when the first derivative is the smallest. This occurs when t = 4.Curve Sketching1) Starting with f (x), we compute

2) Next, we locate all relative maximum and relative minimum points and make a partial sketch.3) We study the concavity of f (x) and locate all inflection points.4) We consider other properties of the graph, such as the intercepts, and complete the sketch.A General Approach to Curve SketchingCritical ValuesDefinitionExampleCritical Values: Given a function f (x), a number a in the domain such that For the function below, notice that the slope of the function is 0 at x = 2 and x = 2. The function has a local maximum at x = 2 and local minimum at x = 0.

First Derivative Test

First Derivative TestEXAMPLESOLUTIONFind the local maximum and minimum points of First we find the critical values and critical points of f:

The first derivative if 9x 3 = 0 or 2x + 1 = 0. Thus the critical values are

x = 1/3 and x = 1/2.Substituting the critical values into the expression of f:First Derivative Test

CONTINUED

Thus the critical points are (1/3, 43/18) and (1/2, 33/8). To tell whether we have a relative maximum, minimum, or neither at a critical point we shall apply the first derivative test. This requires a careful study of the sign of , which can be facilitated with the aid of a chart. Here is how we can set up the chart.

First Derivative TestCONTINUED Divide the real line into intervals with the critical values as endpoints. Since the sign of depends on the signs of its two factors 9x 3 and 2x + 1, determine the signs of the factors of over each interval. Usually this is done by testing the sign of a factor at points selected from each interval. In each interval, use a plus sign if the factor is positive and a minus sign if the factor is negative. Then determine the sign of over each interval by multiplying the signs of the factors and using

A plus sign of corresponds to an increasing portion of the graph f and a minus sign to a decreasing portion. Denote an increasing portion with an upward arrow and a decreasing portion with a downward arrow. The sequence of arrows should convey the general shape of the graph and, in particular, tell you whether or not your critical values correspond to extreme points.

First Derivative TestCONTINUEDCritical Points, Intervals9x 32x + 1

x < 1/2 1/2 < x < 1/3x > 1/3____++++__+__Increasing onIncreasing on

Decreasing on

1/21/3Local maximumLocal minimum

First Derivative TestCONTINUEDYou can see from the chart that the sign of varies from positive to negative at x = 1/2. Thus, according to the first derivative test, f has a local maximum at x = 1/2. Also, the sign of varies from negative to positive at x = 1/3; and so f has a local minimum at x = 1/3. In conclusion, f has a local maximum at ( 1/2, 33/8) and a local minimum at (1/3, 43/18).

NOTE: Upon the analyzing the various intervals, had any two consecutive intervals not alternated between increasing and decreasing, there would not have been a relative maximum or minimum at the value for x separating those two intervals.Second Derivative Test

Second Derivative TestEXAMPLESOLUTIONLocate all possible relative extreme points on the graph of the functionWe have

Check the concavity at these points and use this informationto sketch the graph of f (x).

The easiest way to find the critical values is to factor the expression for

Second Derivative TestFrom this factorization it is clear that will be zero if and only if x = 3 or x = 1. In other words, the graph will have horizontal tangent lines when x = 3 and x = 1, and no where else. To plot the points on the graph where x = 3 and x = 1, we substitute these values back into the original expression for f (x). That is, we compute

Therefore, the slope of f (x) is 0 at the points ( 3, 0) and ( 1, 4).CONTINUED

Next, we check the sign of at x = -3 and at x = 1 and apply the second derivative test:

(local maximum)(local minimum).Second Derivative TestThe following is a sketch of the function.CONTINUED

(-3, 0)(-1, -4)Test for Inflection Points

Second Derivative TestEXAMPLESOLUTIONSketch the graph ofWe have

We set and solve for x.

(critical values)Second Derivative TestSubstituting these values of x back into f (x), we find thatWe now compute

CONTINUED

(local maximum)(local minimum)Second Derivative TestSince the concavity reverses somewhere between , there must be at least one inflection point. If we set , we find thatSo the inflection point must occur at x = 0. In order to plot the inflection point, we compute

CONTINUED

The final sketch of the graph is given below.Second Derivative TestCONTINUED

(0, 2)

Second Derivative TestEXAMPLESOLUTIONSketch the graph ofWe have

We set and solve for x.

(critical value)

Second Derivative TestSince , we know nothing about the graph at x = 2. However, the test for inflection points suggests that we have an inflection point at x = 2. First, lets verify that we indeed have an inflection point at x = 2. If this proves to be not the case, we would use a similar method (using the first derivative) to see if we have a relative extremum at x = 2.

CONTINUEDNotice, x = 2 was the only candidate for generating a relative extremum. Therefore, there are no relative extrema. We will now find the y-coordinate for the inflection point.

So, the only inflection point is at (2, 3).Second Derivative TestNow we will look for intercepts. Lets first look for a y-intercept by evaluating f (0).CONTINUEDSo, we have a y-intercept at (0, -5). To find any x-intercepts, we replace f (x) with 0.

Since this equation does not factor, and the quadratic formula cannot help us either, we attempt to use the Rational Roots Theorem from algebra. In doing so we find that there are no rational roots (x-intercepts). So, if there is an x-intercept, it will be an irrational number. Below, we show some of the work employed in estimating the x-intercept.Second Derivative TestCONTINUED x f (x) 0.54 0.11 0.55 0.05 0.56 0.01 0.57 0.08Notice that the y-values corresponding to x = 0.54 and x = 0.55 are below the x-axis and the y-values corresponding to x = 0.56 and x = 0.57 are above the x-axis. Therefore, in between x = 0.55 and x = 0.56, there must be an x-intercept. For the sake of brevity, well just take x = 0.56 for our x-intercept since, out of the four x-values above, it has the y-value closest to zero. Therefore, the point of our x-intercept is (0.56, 0).Now we will sketch a graph of the function.Second Derivative TestCONTINUED

(0, 5)(0.56, 0)(2, 3) f (x) yields information about where things are on a graph. yields information about slope on a graph.

yields information about concavity on a graph.

Curve Sketching Techniques

Curve Sketching Techniques

Graphs on closed intervalsLet f (x) = x3 3x2 9x + 1, 2 x 6.Find the intervals on which the function f is increasing or decreasing and find the local maximum and minimum, if any.Find the intervals on which the graph of f is concave up or concave down and find the points of inflection, if any.What is the absolute maximum? Minimum?Sketch the graph of f.Interval(2, 1)(1, 3)(3, 6)Sign of f ++Conclusion

Local maximum: (1, 6) & (6, 55)Local minimum: (2, 1) & (3, 26)Absolute maximum: (6, 55)Absolute minimum: (3, 26)EXAMPLESOLUTIONGraphs on closed intervalsInterval(2, 1)(1, 6)Sign of f +Conclusion

Inflection point: (1, 10)CONTINUED(-1, 6)(-2, -1)(3, -26)(6, 55)

(1, -10)Graphs with AsymptotesEXAMPLESOLUTIONSketch the graph ofWe have

We set and solve for x.

(critical values - Minimum)

Interval(0, 2)(2, )Sign of f ConclusionInterval(0, )Sign of f +ConclusionGraphs with AsymptotesCONTINUEDBefore sketching the graph, notice that as x approaches zero the term 12/x in the formula for f (x) is dominant. That is, this term becomes arbitrarily large, whereas the terms 3x + 1 contribute a diminishing proportion to the function value as x approaches 0. Thus f (x) has the y-axis as an asymptote. For large values of x, the term 3x is dominant. The value of f (x) is only slightly larger than 3x since the terms 12/x + 1 has decreasing significance as x becomes arbitrarily large; that is, the graph of f (x) is slightly above the graph of y = 3x + 1. As x increases, the graph of f (x) has the line y = 3x + 1 as an asymptote.Graphs with AsymptotesCONTINUED

(2, 13)y = 3x + 1Optimization ProblemsEXAMPLESOLUTIONFind two positive numbers x and y that maximize Q = x2y if x + y = 6.Solving x + y = 6 for y gives y = 6 x. Substituting into Q = x2y yields The maximum value of Q occurs at x = 4 and y = 2.

Maximizing AreaEXAMPLESOLUTIONFind the dimensions of the rectangular garden of greatest area that can be fenced off (all four sides) with 300 meters of fencing.Lets start with what we know. The garden is to be in the shape of a rectangle. The perimeter of it is to be 300 meters. Lets make a picture of the garden, labeling the sides.xxyySince we know the perimeter is 300 meters, we can now construct an equation based on the variables contained within the picture.x + x + y + y = 2x + 2y = 300(Constraint Equation)Maximizing AreaNow, the quantity we wish to maximize is area. Therefore, we will need an equation that contains a variable representing area. This is shown below.(Objective Equation)A = xyCONTINUEDNow we will rewrite the objective equation in terms of A (the variable we wish to optimize) and either x or y. We will do this, using the constraint equation. Since it doesnt make a difference which one we select, we will select x.2x + 2y = 300This is the constraint equation.2y = 300 2xSubtract.y = 150 xDivide.Now we substitute 150 x for y in the objective equation so that the objective equation will have only one independent variable.Maximizing AreaCONTINUEDA = xyThis is the objective equation.Now we will graph the resultant function, A = 150x x2.A = x(150 x)Replace y with 150 x.A = 150x x2Distribute.

Maximizing AreaCONTINUEDSince the graph of the function is obviously a parabola, then the maximum value of A (along the vertical axis) would be found at the only value of x for which the first derivative is equal to zero.A = 150x x2This is the area function.A = 150 2xDifferentiate.150 2x = 0Set the derivative equal to 0.x = 75Solve for x.Therefore, the slope of the function equals zero when x = 75. Therefore, that is the x-value for where the function is maximized. Now we can use the constraint equation to determine y.2x + 2y = 3002(75) + 2y = 300y = 75So, the dimensions of the garden will be 75 m x 75 m.Minimizing CostEXAMPLESOLUTIONA rectangular garden of area 75 square feet is to be surrounded on three sides by a brick wall costing $10 per foot and on one side by a fence costing $5 per foot. Find the dimensions of the garden such that the cost of materials is minimized.Below is a picture of the garden. The red side represents the side that is fenced.xxyyThe quantity that we will be minimizing is cost. Therefore, our objective equation will contain a variable representing cost, C.Minimizing CostCONTINUED(Objective Equation)C = (2x + y)(10) + y(5)C = 20x + 10y + 5yC = 20x + 15yNow we will determine the constraint equation. The only piece of information we have not yet used in some way is that the area is 75 square feet. Using this, we create a constraint equation as follows.75 = xy(Constraint Equation)Now we rewrite the constraint equation, isolating one of the variables therein.75 = xy75/y = x

Minimizing CostCONTINUEDThis is the objective equation.C = 20x + 15yNow we rewrite the objective equation using the substitution we just acquired from the constraint equation.Replace x with 75/y.C = 20(75/y) + 15ySimplify.C = 1500/y + 15yNow we use this equation to sketch a graph of the function.Minimizing CostCONTINUEDIt appears from the graph that there is exactly one relative extremum, a relative minimum around x = 10 or x = 15. To know exactly where this relative minimum is, we need to set the first derivative equal to zero and solve (since at this point, the function will have a slope of zero).This is the given equation.C = 1500/y + 15yDifferentiate.C = 1500/y2 + 15Set the function equal to 0. 1500/y2 + 15 = 0Add.15 = 1500/y2Multiply.15y2 = 1500Divide.y2 = 100Take the positive square root of both sides (since y > 0).y = 10Minimizing CostCONTINUEDTherefore, we know that cost will be minimized when y = 10. Now we will use the constraint equation to determine the corresponding value for x.75 = xyThis is the constraint equation.75 = x(10)Replace y with 10.7.5 = xSolve for x.So the dimensions that will minimize cost, are x = 7.5 ft and y = 10 ft.

Minimizing Surface AreaEXAMPLESOLUTION(Volume) A canvas wind shelter for the beach has a back, two square sides, and a top. Find the dimensions for which the volume will be 250 cubic feet and that requires the least possible amount of canvas.Below is a picture of the wind shelter.xxyThe quantity that we will be minimizing is surface area. Therefore, our objective equation will contain a variable representing surface area, A.Minimizing Surface AreaCONTINUEDA = xx + xx + xy + xyA = 2x2 + 2xy(Objective Equation)Now we will determine the constraint equation. The only piece of information we have not yet used in some way is that the volume is 250 ft3. Using this, we create a constraint equation as follows.250 = x2y(Constraint Equation)Now we rewrite the constraint equation, isolating one of the variables therein.250 = x2y250/x2 = ySum of the areas of the sides

Minimizing Surface AreaCONTINUEDThis is the objective equation.Now we rewrite the objective equation using the substitution we just acquired from the constraint equation.Replace y with 250/x2.Simplify.Now we use this equation to sketch a graph of the function.A = 2x2 + 2xyA = 2x2 + 2x(250/x2)A = 2x2 + 500/xMinimizing Surface AreaCONTINUEDIt appears from the graph that there is exactly one relative extremum, a relative minimum around x = 5. To know exactly where this relative minimum is, we need to set the first derivative equal to zero and solve (since at this point, the function will have a slope of zero).This is the given equation.Differentiate.Set the function equal to 0.4x 500/x2 = 0Add.4x = 500/x2Multiply.4x3 = 500Divide.x3 = 125Take the cube root of both sides.x = 5A = 2x2 + 500/xA = 4x 500/x2Minimizing Surface AreaCONTINUEDTherefore, we know that surface area will be minimized when x = 5. Now we will use the constraint equation to determine the corresponding value for y.250 = x2yThis is the constraint equation.250 = (5)2yReplace x with 5.10 = ySolve for y.So the dimensions that will minimize surface area, are x = 5 ft and y = 10 ft.Chart11615.2114.4413.6912.9612.2511.5610.8910.249.6198.417.847.296.766.255.765.294.844.4143.613.242.892.562.251.961.691.441.2110.810.640.490.360.250.160.090.040.0100.010.040.090.160.250.360.490.640.8111.211.441.691.962.252.562.893.243.6144.414.845.295.766.256.767.297.848.4199.6110.2410.8911.5612.2512.9613.6914.4415.2116

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