Answer
D= (-$\infty$,-7) U (-7,3) U (3,$\infty$)
Work Step by Step
x$^2$+4x-21$\ne$0
(x+7)(x-3)$\ne$0
x$\ne$-7 or 3
Therefore, the domain includes all real numbers except for -7 and 3.
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 2 - Summary, Review, and Test - Review Exercises - Page 326: 73
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