Answer
$x=3, -3$
Work Step by Step
$5z^2-45=0$
$5z^2-45+45=0+45$
$5z^2=45$
$5z^2/5=45/5$
$z^2 =9$
$\sqrt {x^2} =\sqrt 9$
$x=3, -3$
Algebra 1
by Hall, Prentice
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
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