Answer
$$x=-4,\:x=7$$
Work Step by Step
A rational expression is undefined when the denominator is equal to zero. Thus, we set the denominator equal to zero to find:
$$ x^2-3x-28=0 \\ \left(x+4\right)\left(x-7\right)=0 \\ x=-4,\:x=7$$
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 - 6.1 Rational Expressions - 6.1 Exercise Set - Page 379: 15
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