(x-1)^2 + (x-2)(x+2) = x^2 - 2x + 1 + x^2 - 4 = 2x^2 - 2x - 3
(x-2)(x^2 + 2x + 4) - x^3 = x^3 + 2x^2 + 4x - 2x^2 - 4x - 8 - x^3 = -8
(3x-1)(2x+1) - (6x^2-1) = 6x^2 + 3x - 2x - 1 - 6x^2 + 1 = x
(1-5x)(1+5x) + (2+x)(2-x) = 1 - 5x + 5x - 25x^2 + 4 - 2x + 2x - x^2 = 5x - 25x^2 + 2
(x-1)^2 + (x-2)(x+2) = x^2 - 2x + 1 + x^2 - 4 = 2x^2 - 2x - 3
(x-2)(x^2 + 2x + 4) - x^3 = x^3 + 2x^2 + 4x - 2x^2 - 4x - 8 - x^3 = -8
(3x-1)(2x+1) - (6x^2-1) = 6x^2 + 3x - 2x - 1 - 6x^2 + 1 = x
(1-5x)(1+5x) + (2+x)(2-x) = 1 - 5x + 5x - 25x^2 + 4 - 2x + 2x - x^2 = 5x - 25x^2 + 2