Answer
(a) $ u=x^2+9$.
(b) $ u=x^3$.
(c) $ u=\cos x $.
Work Step by Step
(a) Here, we can use the substitution $ u=x^2+9$.
(b) Here, we can use the substitution $ u=x^3$.
(c) Here, we can use the substitution $ u=\cos x $.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 5 - The Integral - 5.7 Substitution Method - Preliminary Questions - Page 275: 2
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