Answer
$r = 6, -6$
Work Step by Step
$5r^2 - 180 = 0$
$5r^2 - 180 +180= 0+180$
$5r^2 = 180$
$5r^2/5 = 180/5$
$r^2 = 36$
$\sqrt {r^2} = \pm\sqrt {36}$
$r = 6, -6$
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 - Mid-Chapter Quiz - Page 560: 15
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