Answer
$B$
Work Step by Step
Take the square root of both sides to obtain:
$\sqrt{x^2}=\pm \sqrt{20}
\\x = \pm \sqrt{4(5}
\\x=\pm 2\sqrt{5}$
Thus, the answer is $B$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - 1.4 Quadratic Equations - 1.4 Exercises - Page 121: 6
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
