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: 8

Answer

$x=-7$ or $x=9$

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. $(x+7)(x-9)=0$ A product is zero when either factor is zero. $x+7=0$ or $x-9=0$ Use the addition property of equality to solve both equations for x. $x+7-7=0-7$ or $x-9+9=0+9$ Simplify. $x=-7$ or $x=9$
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