Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 2: Limits and Continuity - Section 2.6 - Limits Involving Infinity; Asymptotes of Graphs - Exercises 2.6 - Page 99: 90

Answer

See explanations.

Work Step by Step

Step 1. To prove the limit $\lim_{x\to0}\frac{1}{|x|}=\infty$, for any large positive number $B$, we need to find a corresponding value $\delta\gt0$ so that for all x in the interval $0\lt|x|\lt\delta$, we get $\frac{1}{|x|}\gt B$ Step 2. The last inequality gives $|x|\lt 1/B$ ; thus we can choose $\delta=1/ B$ and when we go back in the steps, for all x in the interval $0\lt|x|\lt\delta$, we get $\frac{1}{|x|}\gt B$ which proves the limit statement.
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