Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 3 - Applications of Differentiation - 3.5 Exercises - Page 203: 71

Answer

Graph

Work Step by Step

$$\eqalign{ & y = 3 + \frac{2}{x} \cr & {\text{Find the }}y{\text{ intercept, let }}x = 0 \cr & y = 3 + \frac{2}{0} \cr & {\text{No }}y{\text{ - intercept}}{\text{.}} \cr & {\text{Find the }}x{\text{ intercept, let }}y = 0 \cr & 0 = 3 + \frac{2}{x} \to x = - \frac{2}{3} \cr & x{\text{ - intercept }}\left( { - \frac{2}{3},0} \right) \cr & \cr & *{\text{Find the extrema}} \cr & {\text{Differentiate}} \cr & y' = \frac{d}{{dx}}\left[ {3 + \frac{2}{x}} \right] \cr & y' = - \frac{2}{{{x^2}}} \cr & {\text{Let }}y' = 0 \cr & - \frac{2}{{{x^2}}} = 0,{\text{ there are no values at which }}y' = 0. \cr & {\text{No relative extrema}}{\text{.}} \cr & \cr & {\text{*Calculate the asymptotes}} \cr & 3 + \frac{2}{x} \cr & x = 0 \to x = 0 \cr & {\text{Vertical asymptote at }}x = 0 \cr & \mathop {\lim }\limits_{x \to \infty } \left( {3 + \frac{2}{x}} \right) = 3 \cr & \mathop {\lim }\limits_{x \to - \infty } \left( {3 + \frac{2}{x}} \right) = 3 \cr & {\text{Horizontal asymptote }}y = 3 \cr & \cr & {\text{*Symmetry}} \cr & f\left( { - x} \right) = 3 + \frac{2}{{\left( { - x} \right)}} \cr & f\left( { - x} \right) = 3 - \frac{2}{x} \cr & {\text{Neither odd nor even, so there is no symmetry}}{\text{.}} \cr & \cr & {\text{Graph}} \cr} $$
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