Simplify: x2−4x2+4x+4\frac{x^2 - 4}{x^2 + 4x + 4}x2+4x+4x2−4 (assume x≠−2x \neq -2x=−2).
x−2x+2\frac{x-2}{x+2}x+2x−2
x+2x−2\frac{x+2}{x-2}x−2x+2
x−2x−2\frac{x-2}{x-2}x−2x−2
1x+2\frac{1}{x+2}x+21