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 - Page 121: 2



Work Step by Step

Take the square root of both sides to obtain: $\sqrt{x^2}=\pm \sqrt{-25} \\x = \pm \sqrt{25(-1)} \\x = \pm \sqrt{5^2(-1)} \\x=\pm5\sqrt{-1}$ Since $\sqrt{-1}=i$, then, $x=\pm i$ Thus, the answer is $A$.
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