Answer
$-(m+n)$
Work Step by Step
$\frac{m^{2}-n^{2}}{n-m}=\frac{(m+n)(m-n)}{n-m}=\frac{(m+n)(m-n)}{-(m-n)}=\frac{m+n}{-1}\times\frac{m-n}{m-n}=-(m+n)\times1=-(m+n)$
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: 56
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