Which of the following are equivalent to x2−9x2+5x+6\frac{x^2 - 9}{x^2 + 5x + 6}x2+5x+6x2−9?
x−3x+2\frac{x-3}{x+2}x+2x−3
x+3x−2\frac{x+3}{x-2}x−2x+3
(x−3)(x+3)(x+2)(x+3)\frac{(x-3)(x+3)}{(x+2)(x+3)}(x+2)(x+3)(x−3)(x+3)
x2−9x2+5x+6\frac{x^2-9}{x^2+5x+6}x2+5x+6x2−9