Answer
15 feet
Work Step by Step
Area=a$^{2}$
Area=225
a$^{2}$=225
a=±$\sqrt{225}$
a=±15
a=-15 or a=15
since negative result does not make sense then the real solution is 15
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 8 - Section 8.1 - Solving Quadratic Equations by Completing the Square - Exercise Set - Page 484: 83
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