College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 3, Polynomial and Rational Functions - Section 3.6 - Rational Functions - 3.6 Exercises - Page 344: 23

Answer

x-intercepts: $-1$ and $2.$ y-intercept: $\displaystyle \frac{1}{3}.$

Work Step by Step

The y- intercept is the value $t(0)$, if defined. $t(0)=\displaystyle \frac{0-0-2}{0-6}=\frac{1}{3}$ The x intercepts are values of x where $t(x)=0.$ $t(x)=0$ occurs when the numerator equals 0. The numerator is zero for $x^{2}-x-2=0$ Factor the trinomial $x^{2}+bx+c$ by searching for factors of c whose sum is $b$. We find $-2$ and $+1$. $(x-2)(x+1)=0$ $x=-1, x=2$
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