Precalculus: Mathematics for Calculus, 7th Edition

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

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
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