Simplify: x2−6x+9x2−9\frac{x^2 - 6x + 9}{x^2 - 9}x2−9x2−6x+9
x−3x+3\frac{x - 3}{x + 3}x+3x−3
(x−3)2(x−3)(x+3)\frac{(x-3)^2}{(x-3)(x+3)}(x−3)(x+3)(x−3)2
x−3x - 3x−3
x+3x−3\frac{x + 3}{x - 3}x−3x+3