Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 3 - Section 3.6 - Derivatives of Logarithmic Functions - 3.6 Exercises - Page 223: 22



Work Step by Step

If we first simplify the given function using the properties of logarithms $\frac{d}{dx}(log_{e}(x))=\frac{1}{xlne}$ Then the differentiation becomes easier: Apply product rule. $y'=\frac{1}{(xlog_{5}x)ln2}[x\frac{d}{dx}(log_{5}x)+(log_{5}x)\frac{d}{dx}(x)$ $=\frac{1}{(xlog_{5}x)ln2}[x\times\frac{1}{xln5}+(log_{5}x)(1)]$ $=\frac{1}{(xlog_{5}x)ln2}[\frac{1}{ln5}+(log_{5}x)]$ $y'=\frac{ln5(log_{5}x)+1}{(xlog_{5}x)ln2ln5}$ Hence, $y'=\frac{ln5(log_{5}x)+1}{(xlog_{5}x)ln2ln5}$
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