$$2s^3+10s^2+16s+6 = 0$$
Answer
$$ \begin{matrix}s_1 = -0.53443 & s_2 = -2.23279+0.79255i & s_3 = -2.23279-0.79255i \end{matrix} $$
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