$$x^3+11^2+30x-360 = 0$$
Answer
$$ \begin{matrix}x_1 = 4.63897 & x_2 = -2.31949+6.79265i & x_3 = -2.31949-6.79265i \end{matrix} $$
Explanation
$$ \begin{aligned} x^3+11^2+30x-360 &= 0&& \text{simplify left side} \\[1 em]x^3+121+30x-360 &= 0&& \\[1 em]x^3+30x-239 &= 0&& \\[1 em] \end{aligned} $$
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