а) 3(x-4)+x^2-4x = 3x - 12 + x^2 - 4x = x^2 - x - 12 = (x - 4)(x + 3)
б) 2x-8-x(x-4) = 2x - 8 - x^2 + 4x = -x^2 + 6x - 8 = -1(x^2 - 6x + 8) = -1(x - 4)(x - 2)
в) x^3 + 5x^2 - 2x - 10 = x^3 - x^2 + 6x^2 - 6x - 2x + 12 = x^2(x - 1) + 2x(3x - 1) - 2(3x - 1) = (x^2 + 2x - 2)(x - 1)
г) x^3 - 6x^2 - 2x + 12 = x^3 - 2x^2 - 4x - 4x^2 + 8x + 12 = x^2(x - 2) - 4x(x - 2) + 4(3x - 2) = (x^2 - 4x + 4)(x - 2) = (x - 2)^2(x - 2) = (x - 2)^3
а) 3(x-4)+x^2-4x = 3x - 12 + x^2 - 4x = x^2 - x - 12 = (x - 4)(x + 3)
б) 2x-8-x(x-4) = 2x - 8 - x^2 + 4x = -x^2 + 6x - 8 = -1(x^2 - 6x + 8) = -1(x - 4)(x - 2)
в) x^3 + 5x^2 - 2x - 10 = x^3 - x^2 + 6x^2 - 6x - 2x + 12 = x^2(x - 1) + 2x(3x - 1) - 2(3x - 1) = (x^2 + 2x - 2)(x - 1)
г) x^3 - 6x^2 - 2x + 12 = x^3 - 2x^2 - 4x - 4x^2 + 8x + 12 = x^2(x - 2) - 4x(x - 2) + 4(3x - 2) = (x^2 - 4x + 4)(x - 2) = (x - 2)^2(x - 2) = (x - 2)^3