Question 633835
L*W=AREA.
L=X
W=X-3
X*(X-3)=40
X^2-3X-40=0
(X-8)(X+5)=0
X-8=0
X=8 ANS. FOR THE LENGTH.
W=8-3=5 ANS. FOR THE WIDTH.
PROOF:
8*5=40
40=40