2007-08-08 19:29:43 · 3 answers · asked by mapureed 1 in Science & Mathematics ➔ Mathematics
width = W
length = L
L = 2W - 4
Area = L W
76 = (2W - 4) (W)
76 = 2W ² - 4W
2W ² - 4W - 76 = 0
W ² - 2W - 38 = 0
W = [ 2 ± √(4 + 152) ] / 2
W = [ 2 ± √(156) ] / 2
W = [ 2 ± 12.5 ] / 2
W = 14.5 / 2 (taking +ve value for W)
W = 7.25
L = 2W - 4
L = 14.5 - 4
L = 10.5
Length = 10.5 ft
Width = 7.25 ft
2007-08-08 19:58:05 · answer #1 · answered by Como 7 · 1⤊ 0⤋
L = length = 2W-4
Area = L x W
(2W-4) x W = 76
2W^2 - 4W = 76
W^2 - 2W = 38
W^2 - 2W - 38 = 0
(W - ?)(W+?) = 0 no answer here, so you have to go to the quadratic equation.
2007-08-09 03:11:54 · answer #2 · answered by Anonymous · 0⤊ 1⤋
2(2x-4)+2x=76......go from there
*edit oh, haha srry, i was thinking perimeter, not area
2007-08-09 02:35:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋