Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Lesson Check - Page 563: 4



Work Step by Step

You add 225 to both sides. That gives you $y^2=225$ Then you square root both sides to get the final answer of y=±15 Remember the square root of any number above 0 always has two answers, hence the positive or minus sign (±)
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