1) (1-x)(2+2x) + (2-x)(1-2x) = 2-2x+2x-2x^2 - 2 + 2x - x + 2x^2 = -4
2) (x-2)(x-5) - (x-3)(x-4) = x^2 - 5x - 2x + 10 - x^2 + 4x - 3x + 12 = 6
1) (1-x)(2+2x) + (2-x)(1-2x) = 2-2x+2x-2x^2 - 2 + 2x - x + 2x^2 = -4
2) (x-2)(x-5) - (x-3)(x-4) = x^2 - 5x - 2x + 10 - x^2 + 4x - 3x + 12 = 6