[ x^4 - x^3 + 4*x^2 - 20*x + 23, \ x^4 - 7*x^2 - 7*x + 8, \ x^4 + 9*x^2 + 361, \ x^4 - x^3 - 344*x^2 + 1024*x + 3155, \ x^4 - x^3 - 170*x^2 - 426*x + 2923 ]