x^3+x^2-4x-4=x^2(x+1)-4(x+1)=(x+1)(x^2-4)=(x+1)(x-2)(x+2)
x^3+x^2-4x-4 = x^2(x+1)-4(x+1) = (x^2-4)(x+1) = (x+2)(x-2)(x+1)
x^3+x^2-4x-4=x^2(x+1)-4(x+1)=(x+1)(x^2-4)=(x+1)(x-2)(x+2)
x^3+x^2-4x-4 = x^2(x+1)-4(x+1) = (x^2-4)(x+1) = (x+2)(x-2)(x+1)