Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 7 - Section 7.1 - Rational Expressions and Their Simplification - Exercise Set - Page 491: 7


$x=-9$ or $x=2$

Work Step by Step

A rational expression is undefined when the value of its denominator is zero. Write and solve an expression where the denominator is zero. $(x+9)(x-2)=0$ A product is zero when either factor is zero. $x+9=0$ or $x-2=0$ Use the addition property of equality to solve both equations for x. $x+9-9=0-9$ or $x-2+2=0+2$ Simplify. $x=-9$ or $x=2$
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