Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 3 - Polynomial and Rational Functions - Section 3.5 The Graph of a Rational Function - 3.5 Assess Your Understanding - Page 255: 1

Answer

The intercepts are: $(1,0)$, $(-1,0)$ and $(0, \dfrac{1}{4})$.

Work Step by Step

In order to solve this problem, we will have to recall the following points: (a) The intercepts of a function are those points where the graph crosses the $x-$ axis or the $y-$ axis. (b) We set $y=0$ and then solve for $x$ in order to calculate the x-intercept. (c) We set $x=0$ and then solve for $y$ in order to calculate the y-intercept. Therefore, the intercepts of the function are: The x-intercepts are when $y=0$, so we have: $\dfrac{x^2-1}{x^2-4}=0 \\x^2-1=0\\x^2=1\\x=\pm1$ Now, the y-intercepts are when $x=0$, so we have: $y=\dfrac{0^2-1}{0^2-4}=\dfrac{1}{4}$ Thus, the intercepts are: $(1,0)$, $(-1,0)$, and $(0, \dfrac{1}{4})$
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