Question 617437
L * W * H = 80


H = 2


L * W = 80 / 2 = 40


W * (W + 3) = 40


W^2 + 3W - 40 = 0


(W + 8)(W - 5) = 0


W + 8 = 0 ___ W = -8 ___ negative value not realistic


W - 5 = 0 ___ W = 5


substitute back to find L