Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Lesson Check - Page 550: 4


$$y = \pm15$$

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 $$y = \pm15$$ Remember the square root of any number above 0 always has two answers, hence the positive or minus sign ($\pm$)
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