Expand and simplify: (x−6)(x−2)(x - 6)(x - 2)(x−6)(x−2).
x2−4x+12x^2 - 4x + 12x2−4x+12
x2+8x+12x^2 + 8x + 12x2+8x+12
x2−8x+12x^2 - 8x + 12x2−8x+12
x2−8x−12x^2 - 8x - 12x2−8x−12