Answer
$=\{-2,2\}$
Work Step by Step
This question is asking "What number squared gives $4$?" In this case, squaring $-2$ or $2$ leads to $4$. Thus, $\sqrt{4}=\pm2$.
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 4 - Exponential Functions - Exercises to Skills for Chapter 4 - Page 185: 8
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