Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 68: 71

Answer

$l=\dfrac{A-2wh}{2w+2h}$

Work Step by Step

Subtract $2wh$ on both sides to find: $A-2wh=2lw+2lh$ Factor out $l$ on the right side to find: $A-2wh=l(2w+2h)$ Divide by $2w+2h$ on both sides to find: $\dfrac{A-2wh}{2w+2h} = l \\l=\dfrac{A-2wh}{2w+2h}$
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