Question 311545
W=L-7
A=LW
18=L(L-7)
18=L^2-7L
L^2-7L-18=0
(L-9)(L+2)
L-9=0
L=9 ANS. FOR THE LENGTH.
W=9-7=2 ANS. FOR THE WIDTH.
PROOF:
18=9*2
18=18