Answer
$x=\pm7$ must be excluded from the domain
Work Step by Step
The denominator can't equal zero.
$x^2 - 49=0$
$x^2=49$
$x=\pm\sqrt {49}=\pm7$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.6 - Rational Expressions - Exercise Set - Page 84: 4
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