Answer
$x^2-9$
Work Step by Step
$x+3=x+3$, $x^2-9=(x+3)(x-3)$, so the GCF is $x+3$ and the terms that are "not common" are $x-3$ so LCD$=(x+3)(x-3)=x^2-9$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 6 - Section 6.2 - Adding and Subtracting Rational Expressions - Exercise Set - Page 427: 20
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