Answer
Graph (a).
Work Step by Step
The sharp corner in the graph shows which function is not differentiable at that point.
f'(x) is not differentiable at point a and b, which is shown only in graph (a).
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 4 - Section 4.1 - Extreme Values of Functions - Exercises - Page 215: 14
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