Answer
Missing, denominator
Work Step by Step
Once we figure out what the least common denominator is, we must multiply by the missing factors to change the expressions' $\underline{denominator}$ to the least common denominator.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 6 - Rational Expressions and Equations - 6.4 Addition and Subtraction with Unlike Denominators - 6.4 Exercise Set - Page 400: 2
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