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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

Find the absolute maximum and absolute minimum values of f on the given interval.

f ( x ) = 3 x 4 4 x 3 12 x 2 + 1 ,    [ 2 , 3 ]

To determine

To find:

The absolute maximum and absolute minimum values of f(x) on the given interval.

Explanation

1) Concept:

Use the Closed Interval Method to find the absolute maximum and minimum values of f(x).

The Closed Interval Method:

To find the absolute maximum and minimum values of a continuous function f on a closed interval a, b:

i. Find the values of f at the critical numbers of f in a, b.

ii. Find the values of f at the end points of the interval .

iii. The largest of the values from step (i) and (ii) is the absolute maximum value; the smallest of these values is the absolute minimum value.

2) Given:

 fx=3x4-4x3-12x2+1, -2, 3

3) Calculation:

Since f(x) is continuous on -2, 3, use the Closed Interval Method.

Differentiate f(x) with respect to x, and then find the values of x, where f'x=0 and f'x doesn’t exist.

By using the power rule of derivative,

f'x=12x3-12x2-24x

f'x=12xx2-x-2

f'x=12x(x+1)(x-2)

Substitute  f'x =0, and solve for x.

0=12x(x+1)(x-2)

Hence, x= 0, x= -1, & x= 2.

Since f'x exists for all x, then x= 0, -1, 2 are the only critical points of fx.

Also, the critical numbers x= 0, x= -1, & x= 2  lie in interval (-2, 3).

Now, evaluate fx at the critical numbers and end points of the given interval -2, 3

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