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 - Practice and Problem-Solving Exercises - Page 551: 31


$x=3, -3$

Work Step by Step

$5z^2-45=0$ $5z^2-45+45=0+45$ $5z^2=45$ $5z^2/5=45/5$ $z^2 =9$ $\sqrt {x^2} =\sqrt 9$ $x=3, -3$
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