$$x^3-2x^2+7x+2 = 0$$
Answer
$$ \begin{matrix}x_1 = -0.2633 & x_2 = 1.13165+2.51302i & x_3 = 1.13165-2.51302i \end{matrix} $$
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