x^3 - x^2 - 2*x + 1 x^3 + 2*x - 2 x^3 - x^2 + 2*x - 3 x^3 - x^2 + 2*x + 2 x^3 - x^2 + 5*x - 13 x^3 - x^2 + 5*x + 15 x^3 - x^2 - 23*x - 13