Precalculus (6th Edition)

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: 6

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 $B$.
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