Calculus: Early Transcendentals 8th Edition

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

Chapter 2 - Section 2.6 - Limits at Infinity; Horizontal Asymptotes - 2.6 Exercises - Page 138: 41



Work Step by Step

$$A=\lim\limits_{x\to\infty}[\ln(1+x^2)-\ln(1+x)]$$$$A=\lim\limits_{x\to\infty}\Bigg[\ln\Big(\frac{1+x^2}{1+x}\Big)\Bigg]$$$$A=\ln\Bigg[\lim\limits_{x\to\infty}\Big(\frac{1+x^2}{1+x}\Big)\Bigg]$$ Divide both numerator and denominator by $x$, we have $$A=\ln\Bigg[\lim\limits_{x\to\infty}\Big(\frac{\frac{1}{x}+x}{\frac{1}{x}+1}\Big)\Bigg]$$ As $x\to\infty$, $(\frac{1}{x}+x)$ approaches $0+\infty=\infty$ while $(\frac{1}{x}+1)$ approaches $0+1=1$ Therefore, $\frac{\frac{1}{x}+x}{\frac{1}{x}+1}$ approaches $\infty$ So, $$A=\ln(\infty)=\infty$$
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