$$x^3-4x^2-x+16 = 0$$
Answer
$$ \begin{matrix}x_1 = -1.75632 & x_2 = 2.87816+0.90892i & x_3 = 2.87816-0.90892i \end{matrix} $$
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