Answer
$$\pm9$$
Work Step by Step
Solving the equation using the rules of Algebra, we find:
$$c^2=225-144 \\ c^2=81\\ c=\sqrt{81},\:c=-\sqrt{81} \\ c=\pm9$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 9 Quadratic Relations and Conic Sections - 9.3 Graph and Write Equations of Circles - 9.3 Exercises - Mixed Review - Page 632: 81
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