Answer
$x=\pm\sqrt7$.
Work Step by Step
According to the square root property, if $u^2=d$, then $u=\pm\sqrt{d}$
Hence here if $x^2=7$, then $x=\pm\sqrt7$.
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 8 - Section 8.1 - The Square Root Property and Completing the Square - Concept and Vocabulary Check - Page 592: 2
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