(x + 1).(x^2 - x + 1), (x-1)(x^2+x+1), (x-1) (x^2+x+1), (x + 1) (x^2 - x + 1), (x + 1)(x^2 - x + 1), (x+1) (x^2 -x +1), |x - 1| + |x - 2| + | x - (-1)|, (x+1)(x^2-x+1)