[ x^4 - 2*x^3 - 4*x^2 + x + 3, \ x^4 - x^3 + 4*x^2 - 20*x + 23, \ x^4 - 9*x^2 + 100, \ x^4 - x^3 - 83*x^2 + 241*x + 23 ]