Answer
$c= 144$
Work Step by Step
$x^2-c=0$ has 12, -12 as solutions
$12^2-c=0$
$144-c=0$
$144-c+c=0+c$
$144= c$
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 552: 49
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