Answer
$f$ is not differentiable when $x = -4$ and $x = 0$
Work Step by Step
$f$ is not differentiable when $x = -4$ since it has a corner and when $x = 0$ since $f$ is not continuous
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 2 - Derivatives - 2.2 The Derivative as a Function - 2.2 Exercises - Page 128: 39
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