$$x^3+3x^2+2x = 50.616$$
Answer
$$ \begin{matrix}x_1 = 2.77449 & x_2 = -2.88725+3.11209i & x_3 = -2.88725-3.11209i \end{matrix} $$
Explanation
$$ \begin{aligned} x^3+3x^2+2x &= 50.616&& \text{move all terms to the left hand side } \\[1 em]x^3+3x^2+2x-50 &= 0&& \\[1 em] \end{aligned} $$
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