Answer
$A = -l^2+70l$
Work Step by Step
$A = l*w$
$P = 2w+2l$
$140 = 2(w+l)$
$140/2 = 2(w+l)/2$
$70 = w+l$
$70-l = w+l-l$
$70-l = w$
$A = l*w$
$A = l *(70-l)$
$A = 70l-l^2$
$A = -l^2+70l$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - Concept Byte - Collecting Quadratic Data - Page 547: 4
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