Answer
$(-\infty,+\infty)$
Work Step by Step
$f(x)+g(x)=x^2+4x+2-x$ add like terms
$x^2+3x+2$ The domain is $\mathbf{R}$ $(-\infty,+\infty)$
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: 47
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