For this case we have that the area is given by: A = (w) * (l) Where, w: width l: long Substituting we have: 66 = (w) * (w + 5) Rewriting w ^ 2 + 5w - 66 = 0 (w + 11) * (w-6) = 0 Using the positive root we have: w = 6 Answer: the width of the frame is: w = 6 cm