Answer
$\frac{w + z}{w-z}$
Work Step by Step
$\frac{w}{w-z} - \frac{z}{z-w}$
$=\frac{w}{w-z} - \frac{z \times (-1)}{(z-w) \times (-1)}$
$=\frac{w}{w-z} - \frac{-z}{w-z}$
$=\frac{w - (-z)}{w-z}$
$=\frac{w + z}{w-z}$
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 6.2 - Adding and Subtracting Rational Expressions - 6.2 Exercises - Page 383: 63
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