Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 4 - Section 4.1 - Maximum and Minimum Values - 4.1 Exercises - Page 284: 60

Answer

The absolute maximum is $f(1) = \sqrt{e}$ The absolute minimum is $f(-2) = -\frac{2}{e}$

Work Step by Step

$f(x) = xe^{x/2}$ We can find the points when $f'(x) = 0$: $f(x) = xe^{x/2}$ $f'(x) = e^{x/2}+\frac{xe^{x/2}}{2} = 0$ $\frac{xe^{x/2}}{2} = -e^{x/2}$ $x = -2$ We can find the value of $f(-2)$ and the values of the function at the endpoints of the interval $[-3, 1]$: $f(-2) = (-2)e^{-2/2} = -\frac{2}{e}$ $f(-3) = (-3)e^{-3/2} = -\frac{3}{e^{3/2}} \gt -\frac{2}{e}$ $f(1) = (1)e^{1/2} = \sqrt{e}$ The absolute maximum is $f(1) = \sqrt{e}$ The absolute minimum is $f(-2) = -\frac{2}{e}$
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