Thomas Calculus

George B. Thomas Jr.

Chapter 4

Applications of Derivatives - all with Video Answers

Educators

Section 1

Extreme Values of Functions

Problem 1

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Doruk Isik

Doruk Isik

Numerade Educator

Problem 2

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Matt Just

Numerade Educator

Problem 3

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Doruk Isik

Numerade Educator

Problem 4

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Matt Just

Numerade Educator

Problem 5

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Doruk Isik

Numerade Educator

Problem 6

In Exercises $1-6$ , determine from the graph whether the function has
any absolute extreme values on $[a, b]$ . Then explain how your
answer is consistent with Theorem 1 .

Matt Just

Numerade Educator

Problem 7

In Exercises $7-10,$ find the absolute extreme values and where they
occur.

Doruk Isik

Numerade Educator

Problem 8

In Exercises $7-10,$ find the absolute extreme values and where they
occur.

Matt Just

Numerade Educator

Problem 9

In Exercises $7-10,$ find the absolute extreme values and where they
occur.

Doruk Isik

Numerade Educator

Problem 10

In Exercises $7-10,$ find the absolute extreme values and where they
occur.

Matt Just

Numerade Educator

Problem 11

In Exercises $11-14,$ match the table with a graph.
$$\begin{array}{l}{x} && {f^{\prime}(x)} \\ {a} && {0} \\ {b} && {0} \\ {c} && {5}\end{array}$$

Doruk Isik

Numerade Educator

Problem 12

In Exercises $11-14,$ match the table with a graph.
$$
\begin{array}{cc}{x} & {f^{\prime}(x)} \\ {a} & {0} \\ {b} & {0} \\ {c} & {-5}\end{array}
$$

Khushbu Rani

Numerade Educator

Problem 13

In Exercises $11-14,$ match the table with a graph.
$$
\begin{array}{cc}{x} & {f^{\prime}(x)} \\ {a} & \text{does not exist}\\ {b} & {0} \\ {c} & {-2}\end{array}
$$

Doruk Isik

Numerade Educator

Problem 14

In Exercises $11-14,$ match the table with a graph.
$$
\begin{array}{cc}{x} & {f^{\prime}(x)} \\ {a} & \text{does not exist}\\ {b} & \text{does not exist} \\ {c} & {-1.7}\end{array}
$$

Matt Just

Numerade Educator

Problem 15

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
f(x)=|x|, \quad-1 < x < 2
$$

Doruk Isik

Numerade Educator

Problem 16

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
y=\frac{6}{x^{2}+2}, \quad-1 < x <1
$$

Matt Just

Numerade Educator

Problem 17

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
g(x)=\left\{\begin{array}{ll}{-x,} & {0 \leq x<1} \\ {x-1,} & {1 \leq x \leq 2}\end{array}\right.
$$

Doruk Isik

Numerade Educator

Problem 18

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
h(x)=\left\{\begin{array}{ll}{\frac{1}{x},} & {-1 \leq x<0} \\ {\sqrt{x},} & {0 \leq x \leq 4}\end{array}\right.
$$

Matt Just

Numerade Educator

Problem 19

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
y=3 \sin x, \quad 0 < x < 2 \pi
$$

Doruk Isik

Numerade Educator

Problem 20

In Exercises $15-20,$ sketch the graph of each function and determine
whether the function has any absolute extreme values on its domain.
Explain how your answer is consistent with Theorem $1 .$
$$
f(x)=\left\{\begin{array}{ll}{x+1,} & {-1 \leq x<0} \\ {\cos x,} & {0 < x \leq \frac{\pi}{2}}\end{array}\right.
$$

Matt Just

Numerade Educator

Problem 21

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(x)=\frac{2}{3} x-5, \quad-2 \leq x \leq 3
$$

Melissa Munoz

Numerade Educator

Problem 22

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(x)=-x-4, \quad-4 \leq x \leq 1
$$

Matt Just

Numerade Educator

Problem 23

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(x)=x^{2}-1, \quad-1 \leq x \leq 2
$$

Doruk Isik

Numerade Educator

Problem 24

In Exercises $21-36,$ find the absolute maximum and minimum values of each function on the given interval. Then graph the function. Identify the points on the graph where the absolute extrema occur, and include their coordinates.
$$
f(x)=4-x^{3}, \quad-2 \leq x \leq 1
$$

Matt Just

Numerade Educator

Problem 25

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
F(x)=-\frac{1}{x^{2}}, \quad 0.5 \leq x \leq 2
$$

Doruk Isik

Numerade Educator

Problem 26

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
F(x)=-\frac{1}{x}, \quad-2 \leq x \leq-1
$$

Matt Just

Numerade Educator

Problem 27

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
h(x)=\sqrt[3]{x}, \quad-1 \leq x \leq 8
$$

Doruk Isik

Numerade Educator

Problem 28

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
h(x)=-3 x^{2 / 3}, \quad-1 \leq x \leq 1
$$

Matt Just

Numerade Educator

Problem 29

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
g(x)=\sqrt{4-x^{2}}, \quad-2 \leq x \leq 1
$$

Doruk Isik

Numerade Educator

Problem 30

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
g(x)=-\sqrt{5-x^{2}}, \quad-\sqrt{5} \leq x \leq 0
$$

Matt Just

Numerade Educator

Problem 31

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(\theta)=\sin \theta, \quad-\frac{\pi}{2} \leq \theta \leq \frac{5 \pi}{6}
$$

Doruk Isik

Numerade Educator

Problem 32

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(\theta)=\tan \theta, \quad-\frac{\pi}{3} \leq \theta \leq \frac{\pi}{4}
$$

Matt Just

Numerade Educator

Problem 33

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
g(x)=\csc x, \quad \frac{\pi}{3} \leq x \leq \frac{2 \pi}{3}
$$

Doruk Isik

Numerade Educator

Problem 34

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
g(x)=\sec x, \quad-\frac{\pi}{3} \leq x \leq \frac{\pi}{6}
$$

Matt Just

Numerade Educator

Problem 35

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(t)=2-|t|, \quad-1 \leq t \leq 3
$$

Doruk Isik

Numerade Educator

Problem 36

In Exercises $21-36,$ find the absolute maximum and minimum values
of each function on the given interval. Then graph the function. Identify the points
on the graph where the absolute extrema occur, and
include their coordinates.
$$
f(t)=|t-5|, \quad 4 \leq t \leq 7
$$

Matt Just

Numerade Educator

Problem 37

In Exercises $37-40$ , find the function's absolute maximum and minimum values and say where they occur.
$$
f(x)=x^{4 / 3},-1 \leq x \leq 8
$$

Doruk Isik

Numerade Educator

Problem 38

In Exercises $37-40$ , find the function's absolute maximum and minimum values and say where they occur.
$$
f(x)=x^{5 / 3}, \quad-1 \leq x \leq 8
$$

Matt Just

Numerade Educator

Problem 39

In Exercises $37-40$ , find the function's absolute maximum and minimum values and say where they occur.
$$
g(\theta)=\theta^{3 / 5}, \quad-32 \leq \theta \leq 1
$$

Doruk Isik

Numerade Educator

Problem 40

In Exercises $37-40$ , find the function's absolute maximum and minimum values and say where they occur.
$$
h(\theta)=3 \theta^{2 / 3}, \quad-27 \leq \theta \leq 8
$$

Matt Just

Numerade Educator

Problem 41

In Exercises $41-50,$ determine all critical points for each function.
$$
y=x^{2}-6 x+7
$$

Doruk Isik

Numerade Educator

Problem 42

In Exercises $41-50,$ determine all critical points for each function.
$$
f(x)=6 x^{2}-x^{3}
$$

Matt Just

Numerade Educator

Problem 43

In Exercises $41-50,$ determine all critical points for each function.
$$
f(x)=x(4-x)^{3}
$$

Doruk Isik

Numerade Educator

Problem 44

In Exercises $41-50,$ determine all critical points for each function.
$$
g(x)=(x-1)^{2}(x-3)^{2}
$$

Matt Just

Numerade Educator

Problem 45

In Exercises $41-50,$ determine all critical points for each function.
$$
y=x^{2}+\frac{2}{x}
$$

Doruk Isik

Numerade Educator

Problem 46

In Exercises $41-50,$ determine all critical points for each function.
$$
f(x)=\frac{x^{2}}{x-2}
$$

Matt Just

Numerade Educator

Problem 47

In Exercises $41-50,$ determine all critical points for each function.
$$
y=x^{2}-32 \sqrt{x}
$$

Doruk Isik

Numerade Educator

Problem 48

In Exercises $41-50,$ determine all critical points for each function.
$$
g(x)=\sqrt{2 x-x^{2}}
$$

Matt Just

Numerade Educator

Problem 49

In Exercises $41-50,$ determine all critical points for each function.
$$
y=x^{3}+3 x^{2}-24 x+7
$$

Doruk Isik

Numerade Educator

Problem 50

In Exercises $41-50,$ determine all critical points for each function.
$$
y=x-3 x^{2 / 3}
$$

Matt Just

Numerade Educator

Problem 51

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=x^{2 / 3}(x+2)
$$

Doruk Isik

Numerade Educator

Problem 52

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=x^{2 / 3}\left(x^{2}-4\right)
$$

Matt Just

Numerade Educator

Problem 53

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=x \sqrt{4-x^{2}}
$$

Doruk Isik

Numerade Educator

Problem 54

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=x^{2} \sqrt{3-x}
$$

Matt Just

Numerade Educator

Problem 55

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=\left\{\begin{array}{ll}{4-2 x,} & {x \leq 1} \\ {x+1,} & {x>1}\end{array}\right.
$$

Doruk Isik

Numerade Educator

Problem 56

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=\left\{\begin{array}{ll}{3-x,} & {x<0} \\ {3+2 x-x^{2},} & {x \geq 0}\end{array}\right.
$$

Matt Just

Numerade Educator

Problem 57

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=\left\{\begin{array}{ll}{-x^{2}-2 x+4,} & {x \leq 1} \\ {-x^{2}+6 x-4,} & {x>1}\end{array}\right.
$$

Doruk Isik

Numerade Educator

Problem 58

In Exercises $51-58$ , find the critical points and domain endpoints for
each function. Then find the value of the function at each of these
points and identify extreme values (absolute and local).
$$
y=\left\{\begin{array}{ll}{-\frac{1}{4} x^{2}-\frac{1}{2} x+\frac{15}{4},} & {x \leq 1} \\ {x^{3}-6 x^{2}+8 x,} & {x>1}\end{array}\right.
$$

Matt Just

Numerade Educator

Problem 59

In Exercises 59 and $60,$ give reasons for your answers.
Let
$$
f(x)=(x-2)^{2 / 3}
$$
$$
\begin{array}{l}{\text { a. Does } f^{\prime}(2) \text { exist? }} \\ {\text { b. Show that the only local extreme value of } f \text { occurs at } x=2 \text { . }} \\ {\text { c. Does the result in part (b) contradict the Extreme Value }} \\ {\text { Theorem? }} \\ {\text { d. Repeat parts (a) and (b) for } f(x)=(x-a)^{2 / 3}, \text { replacing } 2 \text { by } a \text { . }}\end{array}
$$

Doruk Isik

Numerade Educator

Problem 60

In Exercises 59 and $60,$ give reasons for your answers.
Let
$$f(x)=\left|x^{3}-9 x\right|$$
$$\begin{array}{ll}{\text { a. Does } f^{\prime}(0) \text { exist? }} & {\text { b. Does } f^{\prime}(3) \text { exist? }} \\ {\text { c. Does } f^{\prime}(-3) \text { exist? }} & {\text { d. Determine all extrema of } f}\end{array}$$

Matt Just

Numerade Educator

Problem 61

In Exercises $61-62,$ show that the function has neither an absolute
minimum nor an absolute maximum on its natural domain.
$$
y=x^{11}+x^{3}+x-5
$$

Doruk Isik

Numerade Educator

Problem 62

In Exercises $61-62,$ show that the function has neither an absolute
minimum nor an absolute maximum on its natural domain.
$$
y=3 x+\tan x
$$

Matt Just

Numerade Educator

Problem 63

A minimum with no derivative The function $f(x)=|x|$ has an
absolute minimum value at $x=0$ even though $f$ is not differen-
tiable at $x=0 .$ Is this consistent with Theorem 2$?$ Give reasons
for your answer.

Doruk Isik

Numerade Educator

Problem 64

Even functions If an even function $f(x)$ has a local maximum
value at $x=c,$ can anything be said about the value of $f$ at
$x=-c ?$ Give reasons for your answer.

Matt Just

Numerade Educator

Problem 65

Odd functions If an odd function $g(x)$ has a local minimum value at $x=c$ , can anything be said about the value of $g$ at $x=-c$ ? Give reasons for your answer.

Vincenzo Zaccaro

Vincenzo Zaccaro

Numerade Educator

Problem 66

No critical points or endpoints exist We know how to find the
extreme values of a continuous function $f(x)$ by investigating its
values at critical points and endpoints. But what if there are no
critical points or endpoints? What happens then? Do such functions
really exist? Give reasons for your answers.

Matt Just

Numerade Educator

Problem 67

The function
$$V(x)=x(10-2 x)(16-2 x), \quad 0 < x < 5$$
$$\begin{array}{l}{\text { models the volume of a box. }} \\ {\text { a. Find the extreme values of } V \text { . }} \\ {\text { b. Interpret any values found in part (a) in terms of the volume }} \\ {\text { of the box. }}\end{array}$$

Doruk Isik

Numerade Educator

Problem 68

Cubic functions Consider the cubic function
$$f(x)=a x^{3}+b x^{2}+c x+d$$
$$\begin{array}{l}{\text { a. Show that } f \text { can have } 0,1, \text { or } 2 \text { critical points. Give examples }} \\ {\text { and graphs to support your argument. }} \\ {\text { b. How many local extreme values can } f \text { have? }}\end{array}$$

Matt Just

Numerade Educator

Problem 69

Maximum height of a vertically moving body The height of a
body moving vertically is given by
$$s=-\frac{1}{2} g t^{2}+v_{0} t+s_{0}, \quad g>0$$
with $s$ in meters and $t$ in seconds. Find the body's maximum
height.

Doruk Isik

Numerade Educator

Problem 70

Peak alternating current Suppose that at any given time $t$ (in
seconds) the current $i$ (in amperes) in an alternating current circuit
is $i=2 \cos t+2 \sin t .$ What is the peak current for this circuit
(largest magnitude)?

Matt Just

Numerade Educator

Problem 71

Graph the functions in Exercises $71-74 .$ Then find the extreme values
of the function on the interval and say where they occur.
$$f(x)=|x-2|+|x+3|, \quad-5 \leq x \leq 5$$

Doruk Isik

Numerade Educator

Problem 72

Graph the functions in Exercises $71-74 .$ Then find the extreme values
of the function on the interval and say where they occur.
$$
g(x)=|x-1|-|x-5|, \quad-2 \leq x \leq 7
$$

Matt Just

Numerade Educator

Problem 73

Graph the functions in Exercises $71-74 .$ Then find the extreme values
of the function on the interval and say where they occur.
$$
h(x)=|x+2|-|x-3|, \quad-\infty < x < \infty
$$

Doruk Isik

Numerade Educator

Problem 74

Graph the functions in Exercises $71-74 .$ Then find the extreme values
of the function on the interval and say where they occur.
$$
k(x)=|x+1|+|x-3|, \quad-\infty< x < \infty
$$

Matt Just

Numerade Educator

Problem 75

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=x^{4}-8 x^{2}+4 x+2, \quad[-20 / 25,64 / 25]
$$

Doruk Isik

Numerade Educator

Problem 76

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=-x^{4}+4 x^{3}-4 x+1, \quad[-3 / 4,3]
$$

Matt Just

Numerade Educator

Problem 77

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=x^{2 / 3}(3-x), \quad[-2,2]
$$

Doruk Isik

Numerade Educator

Problem 78

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=2+2 x-3 x^{2 / 3}, \quad[-1,10 / 3]
$$

Matt Just

Numerade Educator

Problem 79

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=\sqrt{x}+\cos x, \quad[0,2 \pi]
$$

Doruk Isik

Numerade Educator

Problem 80

In Exercises $75-80,$ you will use a CAS to help find the absolute
extrema of the given function over the specified closed interval. Perform
the following steps.
$$\begin{array}{l}{\text { a. Plot the function over the interval to see its general behavior there. }} \\ {\text { b. Find the interior points where } f^{\prime}=0 . \text { (In some exercises, }} \\ {\text { you may have to use the numerical equation solver to approximate }} \\ {\text { a solution.) You may want to plot } f^{\prime} \text { as well. }}\\{\text { c. Find the interior points where } f^{\prime} \text { does not exist. }} \\ {\text { d. Evaluate the function at all points found in parts (b) and (c) }} \\ {\text { and at the endpoints of the interval. }} \\ {\text { e. Find the function's absolute extreme values on the interval }} \\ {\text { and identify where they occur. }}\end{array}$$
$$
f(x)=x^{3 / 4}-\sin x+\frac{1}{2}, \quad[0,2 \pi]
$$

Matt Just

Numerade Educator