$$x^3+9x^2+36 = 0$$
Answer
$$ \begin{matrix}x_1 = -9.40683 & x_2 = 0.20342+1.94567i & x_3 = 0.20342-1.94567i \end{matrix} $$
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