Intermediate Algebra (12th Edition)

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 382: 28



Work Step by Step

We are given the denominators $3r-21$ and $r-7$. In order to find the least common denominator, we must factor each denominator. $3r-21=3\times(r-7)$ $r-7$ cannot be simplified further Next, we multiply together all distinct factors from each denominator, with each factor raised to the greatest power that occurs in any denominator. $LCD=3\times(r-7)=3(r-7)$
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