Question 1070528
let L and W be the length and width of the rectangle
  L=W+6
Area=L*W
    = (W+6)*W
    = W²+6W
also;
   area=72
then;
  W²+6W=72
  W²+6W-72=0
  (W-6)(W+12)=0
   W=6 or W=-12
BUT the dimension can't be negative
then;
   W=6, and
   L=6+6
    =12