Answer
12 ft
Work Step by Step
(x+7)$\times$(x)=228
$x^{2}$+7x=228
$x^{2}$+7x-228=0
quadratic formula:
49-4$\times$(-228)=961
x=$\frac{-7 + or -\sqrt 961}{2}$
dimensions can't be negative so there is just one solution
x=12
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises - Page 76: 42
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