$$x^3+40x^2-1225x-25750 = 0$$
Answer
$$ \begin{matrix}x_1 = 29.8704 & x_2 = -16.00345 & x_3 = -53.86695 \end{matrix} $$
Explanation
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
This page was created using
Polynomial Equations Solver