Answer
Domain $x \geq 3 \text { or } x \leq-3$
Work Step by Step
The expression $x^2-9$, found inside the square root sign, must always be non-negative. This happens when $x \geq 3$ or $x \leq-3$, so our domain is $x \geq 3$ or $x \leq-3$.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 2 - Functions - Review Exercises and Problems for Chapter Two - Page 109: 13
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