Which expression is equivalent to x2−9x^2 - 9x2−9?
(x−3)2(x - 3)^2(x−3)2
(x+3)(x−3)(x + 3)(x - 3)(x+3)(x−3)
(x+9)(x−1)(x + 9)(x - 1)(x+9)(x−1)
(x+3)2(x + 3)^2(x+3)2