Answer
$(-∞,-7)∪(-7,9)∪(9,∞)$
Work Step by Step
Making $x=−7,9$ results in an undefined function, so those values are excluded from the domain.
$f(x)=\frac{1}{x+7}+\frac{3}{x-9}$
$(-∞,-7)∪(-7,9)∪(9,∞)$
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 - Functions and Graphs - Exercise Set 2.6 - Page 297: 9
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