Answer
y=±2$\sqrt5 $
Work Step by Step
Original Equation
y²=20
Take the square root of both sides
y=$\sqrt 20$
Simplify the radical
y=±2$\sqrt 5$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 8 - Section 8.1 - Solving Quadratic Equations by Completing the Square - Exercise Set - Page 482: 6
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