Answer
$-(x+9)$
Work Step by Step
$\frac{x^{2}-81}{9-x}=\frac{(x+9)(x-9)}{9-x}=\frac{(x+9)(x-9)}{-(x-9)}=\frac{x+9}{-1}\times\frac{x-9}{x-9}=-(x+9)\times1=-(x+9)$
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 6 - Section 6.1 - Rational Expressions and Functions; Multiplying and Dividing - 6.1 Exercises - Page 375: 58
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