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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem

The figure shows the graph of the derivative f of a function f.

(a) On what intervals is f increasing or decreasing?

(b) For what values of x does f have a local maximum or minimum?

(c) Sketch the graph of f .

(d) Sketch a possible graph of f.

Chapter 3.R, Problem 16E, The figure shows the graph of the derivative f of a function f. a On what intervals is f increasing

To determine

(a)

To find:

The intervals where is f increasing or decreasing

Explanation

1) Concept:

Increasing / deceasing test:

 I) If f(x) > 0, then the function is increasing

II) If f(x) <0,  then the function is decreasing.

If f(c) = 0, then the function has a critical point c, and hence, the function may not be increasing or decreasing at critical points.

2) Given:

 The graph of a function y = f(x)

3) Calculation:

From the graph of a function y = fx, we see that

Function f is greater than 0 on (-2, 0) and 4, .

Therefore, by the increasing or decreasing test, the function f is increasing on (-2, 0) and (4, )

To determine

(b)

To find:

Values of x for which f has local maximum or minimum

To determine

(c)

To sketch:

The graph of f

To determine

(d)

To sketch:

A possible graph of f

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