Answer
$c = 144$
Work Step by Step
Since the solutions are 12 and -12, the equation must be
$(x-12)(x+12) = 0$
Expand it.
$x^2-144 = 0$
We have found c already.
$c = 144$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises - Page 565: 49
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