Answer
12
Work Step by Step
According to the chain rule,
$\frac{d}{dx}(f(g(x)))=f'(g(x))\times g'(x)$
When $x=6$,
$\frac{d}{dx}(f(g(x)))=f'(g(6))\times g'(6)$
$=f'(6)\times3=4\times3=12$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 3 - Differentiation - 3.7 The Chain Rule - Exercises - Page 147: 87
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