Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 2 - Nonlinear Functions - 2.3 Polynomial and Rational Functions - 2.3 Exercises - Page 74: 18

Answer

$$ y=\frac{-2x^{2}-3}{x^{2}-1} $$ has the lines with equations $ x= 1 $ and $ x= -1 $ as vertical asymptotic, The line $y=-2 $ is a horizontal asymptotic. The y-intercept is 3. This is graph $A$.

Work Step by Step

$$ y=\frac{-2x^{2}-3}{x^{2}-1} $$ The values $x= \pm 1$ makes the denominator 0, but not the numerator, so the lines with equations $$ x=1 , \, x=-1 $$ as vertical asymptotic. To find a horizontal asymptotic, let $x$ get larger and larger, so that $$ y= \lim _{x \rightarrow \infty } \frac{-2x^{2}-3}{x^{2}-1} =- 2. $$ This means that the line $y=-2 $ is a horizontal asymptotic. When $x=0 $ the y-intercept is 3 This is graph $A$.
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