Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 4 - Applications of the Derivative - 4.7 L'Hopital's Rule - 4.7 Exercises - Page 308: 93


The solution is $$\lim_{x\to\infty}\frac{\log_2 x}{\log_3 x}=\frac{\ln 3}{\ln 2}.$$

Work Step by Step

We will use the logarithmic rule for base change which says $$\log_{b}a=\frac{\ln a}{\ln b}.$$ This gives $$\log_{2}x=\frac{\ln x}{\ln 2},\quad \log_{3}x=\frac{\ln x}{\ln 3}.$$ Putting this into the limit we get $$\lim_{x\to\infty}\frac{\log_{2}x}{\log_{3}x}=\lim_{x\to\infty}\frac{\frac{\ln x}{\ln 2}}{\frac{\ln x}{\ln 3}}=\lim_{x\to\infty}\frac{\ln 3}{\ln 2}=\frac{\ln 3}{\ln 2}.$$
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