SOLUTION: The length of a rectangle is 4 cm less than twice the width. If the area is 240 cm2, what is the length of the rectangle?
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Question 908529: The length of a rectangle is 4 cm less than twice the width. If the area is 240 cm2, what is the length of the rectangle? Answer by ewatrrr(24785) (Show Source):
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Hi, .
Lw = 240cm^2
(2w-4)w = 240
2w^2 -4w - 240 = 0
w^2 -2w - 120 = 0 (Tossing out the negative solution for unit measure)
(w+10)(w-12) = 0 , w = 12cm and L = 20cm
and..
product Lw = 140cm^2
.