4 x (4 + 5) = (x - 2)(x + 4 + x - 2)
4 x 9 = (x - 2)(2x + 2)
36 = 2x2 - 2x - 4
x2 - x - 2 = 18
x2 - x - 20 = 0
(x - 5)(x + 4) = 0
x = 5
x = -4 (can't be negative distance)
4 x (4 + 5) = (x - 2)(x + 4 + x - 2)
4 x 9 = (x - 2)(2x + 2)
36 = 2x2 - 2x - 4
x2 - x - 2 = 18
x2 - x - 20 = 0
(x - 5)(x + 4) = 0
x = 5
x = -4 (can't be negative distance)