Which expression is equivalent to x2−6x+9x^2 - 6x + 9x2−6x+9?
(x−3)2(x-3)^2(x−3)2
(x+3)2(x+3)^2(x+3)2
(x−3)(x+3)(x-3)(x+3)(x−3)(x+3)
(x−1)(x−9)(x-1)(x-9)(x−1)(x−9)