Answer
See graph
Work Step by Step
When $x<4$, $f$ has a slope of -1.
When $x>4$, $f$ has a slope of 1.
So the graph of $f'$ should look like a piece-wise function
where $y=-1$ when $x<4$ and $y=1$ when $x>4$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 2 - Differentiation - 2.1 Exercises - Page 103: 42
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