x³ - 3x² - 4x + 12 = x²(x - 3) - 4(x - 3) = (x - 3)(x² - 4) = (x - 3)(x - 2)(x + 2)
x^2(x-3)-4(x-3)=(x-3)(x^2-4)=(x-3)(x-2)(x+2)
x³ - 3x² - 4x + 12 = x²(x - 3) - 4(x - 3) = (x - 3)(x² - 4) = (x - 3)(x - 2)(x + 2)
x^2(x-3)-4(x-3)=(x-3)(x^2-4)=(x-3)(x-2)(x+2)