$$-x^3+x^2+14x+18 = 0$$
Answer
$$ \begin{matrix}x_1 = 4.74752 & x_2 = -1.87376+0.52959i & x_3 = -1.87376-0.52959i \end{matrix} $$
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