$$y^3+2y^2-3y-72 = 0$$
Answer
$$ \begin{matrix}y_1 = 3.79365 & y_2 = -2.89683+3.25384i & y_3 = -2.89683-3.25384i \end{matrix} $$
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