Question 311553
(12-X)(20-X)=84
240-20X-12X+X^2=84
X^2-32X+240-84=0
X^2-32X+156=0
(X-6)(X-26)=0
X-6=0
X=6 CM. ANS. FOR THE WIDTH OF THE FRAANE.
PROOF:
(12-6)(20-6)=84
6*14=84
84=84