Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 4 - Quadratic Functions and Equations - 4-6 Complete the Square - Practice and Problem-Solving Exercises - Page 237: 17


$x=\pm\sqrt 8$

Work Step by Step

First, we add 40 to both sides to isolate $x^2$ with its coefficient, giving us $5x^2=40$. Then, we divide both sides by 5 to fully isolate $x^2$ to get $x^2=8$. Square root both sides to get $x=\pm\sqrt 8$.
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