Answer
$\dfrac{7x-7y}{x^{2}-y^{2}}=\dfrac{7}{x+y}$
Work Step by Step
$\dfrac{7x-7y}{x^{2}-y^{2}}$
Take out common factor $7$ from the numerator and factor the denominator:
$\dfrac{7x-7y}{x^{2}-y^{2}}=\dfrac{7(x-y)}{(x-y)(x+y)}=\dfrac{7}{x+y}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.4 - Adding, Subtracting, and Multiplying Radical Expressions - Exercise Set - Page 711: 79
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