$$x^3+5x^2+15x-7 = 0$$
Answer
$$ \begin{matrix}x_1 = 0.40697 & x_2 = -2.70348+3.1451i & x_3 = -2.70348-3.1451i \end{matrix} $$
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