Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Section 2.6 - Rational Functions and Their Graphs - Exercise Set - Page 399: 30

Answer

No vertical asymptote and $x=5\text{ is a hole}$.

Work Step by Step

If there is a rational function $f\left( x \right)=\frac{p\left( x \right)}{q\left( x \right)}$ where $p\left( x \right)$ is the numerator and $q\left( x \right)$ is the denominator then $x=a$ is a vertical asymptote of the function $f\left( x \right)$ if $x=a$ is a zero of the denominator $q\left( x \right)$. After cancelling the common factor $x-5$ from the numerator and denominator function then, $f\left( x \right)=x+5$ The denominator of the function $f\left( x \right)$ is a constant (there are no values of $x$ for which the denominator is equal to zero). Thus, there is no vertical asymptote. If there is a rational function $f\left( x \right)=\frac{p\left( x \right)}{q\left( x \right)}$ where $p\left( x \right)$ is the numerator and $q\left( x \right)$ is the denominator then $x=a$ is called a hole if $x-a$ is a common factor of the numerator and denominator. We see that $x-5$ a common factor between the numerator and denominator. So, $x=5$ is a hole. Hence, there is no vertical asymptote and $x=5$.
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