Answer
$2.5[\frac{0.9^x}{x}+\ln(x)\ln(0.9)(0.9)^x]$
Work Step by Step
$(kf(x)g(x))'=k[f'(x)g(x)+f(x)g'(x)]$
Calculus Concepts: An Informal Approach to the Mathematics of Change 5th Edition
by LaTorre, Donald R.; Kenelly, John W.; Reed, Iris B.; Carpenter, Laurel R.; Harris, Cynthia R.
Published by
Brooks Cole
ISBN 10:
1-43904-957-2
ISBN 13:
978-1-43904-957-0
Chapter 3 - Determining Change: Derivatives - 3.6 Activities - Page 237: 4
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