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: 44

Answer

(a) $\lim\limits_{x \to \infty}f(x) = 0$ (b) $\lim\limits_{x \to 0^+}f(x) = \infty$ (c) $\lim\limits_{x \to 1^-}f(x) = \infty$ (d) $\lim\limits_{x \to 1^-}f(x) = -\infty$ (e) We can see a sketch of the graph below.

Work Step by Step

$f(x) = \frac{2}{x} - \frac{1}{ln~x}$ (a) As $~~x \to \infty~~$, the value of $\frac{2}{x}$ approaches $0$ while $\frac{1}{ln~x}$ approaches $0$ $\lim\limits_{x \to \infty}f(x) = 0$ (b) As $~~x \to 0^+~~$, the value of $\frac{2}{x}$ approaches $\infty$ while $\frac{1}{ln~x}$ approaches $0$ $\lim\limits_{x \to 0^+}f(x) = \infty$ (c) As $~~x \to 1^-~~$, the value of $\frac{2}{x}$ approaches $2$ while $\frac{1}{ln~x}$ approaches $-\infty$ $\lim\limits_{x \to 1^-}f(x) = \infty$ (d) As $~~x \to 1^+~~$, the value of $\frac{2}{x}$ approaches $2$ while $\frac{1}{ln~x}$ approaches $\infty$ $\lim\limits_{x \to 1^-}f(x) = -\infty$ (e) We can see a sketch of the graph below.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.