$$2x^3+31x^2+72x+99 = 0$$
Answer
$$ \begin{matrix}x_1 = -13.02844 & x_2 = -1.23578+1.50739i & x_3 = -1.23578-1.50739i \end{matrix} $$
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