Answer
$48cm$
Work Step by Step
The eqaution for the area: $0.5x^2+x=1200\\x^2+2x-2400=0\\(x+1)^2=2401\\x+1=49\\x=48$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Section 1.4 - Solving Quadratic Equations - 1.4 Exercises - Page 124: 73
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