Answer
$x=24$.
Work Step by Step
$2\cdot72\cdot48=(72+x)(48+x)\\6912=3456+x^2+120x\\x^2+120x-3456=0\\(x+144)(x-24)=0$
Thus $x=24$ or $x=−144$ but $x$ has to be positive, thus $x=24$.
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 4 Quadratic Functions and Factoring - Chapter Review - Page 319: 21
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