Question 143290
AREA=L*W
A) 720=(2W-4)W
B) 720=2W^2-4W
2W^2-4W-720=0
2(W^2-2W-360)=0
2(W-20)(W+18)=0
W-20=0
W=20 FOR THE WIDTH.
L=2*20-4
L=40-4
L=36 FOR THE LENGTH.
PROOF:
20*36=720
720=720