x^4 - 2*x^3 - 6*x^2 + 7*x + 13 x^4 - x^3 + 7*x - 4 x^4 - x^3 - 19*x^2 - 20*x + 400 x^4 - 15*x^2 - 3 x^4 - x^3 + 6*x^2 - 8*x - 1 x^4 - x^3 - 24*x^2 + x + 11