Answer
$$ du= (8x^3 -8x^{-2})dx $$
Work Step by Step
$$ u=2x^4+8x^{-1}\Longrightarrow du =8x^3 dx -8x^{-2}dx=(8x^3 -8x^{-2})dx $$
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 - Exercises - Page 275: 2
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