$$2x^3+18x^2+48x-40 = 0$$
Answer
$$ \begin{matrix}x_1 = 0.65871 & x_2 = -4.82936+2.65323i & x_3 = -4.82936-2.65323i \end{matrix} $$
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