Answer
H.
Work Step by Step
$x^2=-20$
Take the square root of both sides. Remember that $\sqrt{-1}=i$.
$x=\pm2i\sqrt5$
Thus, the answer is H.
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 1 - Section 1.4 - Quadratic Equations - 1.4 Exercises - Page 111: 5
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