Answer
$(-\infty,+\infty) $
Work Step by Step
$f(x)+g(x)=3x+7+9x+10 $ simplify (add like terms)
$12x+17$ the domain is $\mathbb{R}$ or $(-\infty,+ \infty) $
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 2 - Section 2.3 - The Algebra of Functions - Exercise Set - Page 133: 19
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