Dan S. answered 10/16/19
Mr. Dan Math Tutor
It is a rectangle so Length time Width equals Area L x W = A
The width is three feet less than the length. (W+3) = L
Substitute (W+3) for L and use the area formula
(W+3) (W)= 108
To factor this we two numbers that multiply to equal -108 and subtract to equal 3
(-9 x 12) = 108 and -9+12= 3
Set both factors to equal to 0 and solve.
W+12=0 W=-12 This won't work because the answer can not be negative.
W-9=0 W=9 This one works. The width is 9 the length is 12