Answer
$ R $
Work Step by Step
The domain of any function consists of the values it can take on the x-axis.
Note that we can not have zero in the denominator. However, $ x^2+4\neq 0$, so the domain of $ f $ is the whole real line $ R $.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.3 The Basic Classes of Functions - Exercises - Page 22: 6
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