$$-2x^3+17x^2+16 = 0$$
Answer
$$ \begin{matrix}x_1 = 8.60797 & x_2 = -0.05398+0.96253i & x_3 = -0.05398-0.96253i \end{matrix} $$
Explanation
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
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Polynomial Equations Solver