$$2x^3-3x^2-8x+3 = 0$$
Answer
$$ \begin{matrix}x_1 = 0.34126 & x_2 = -1.59574 & x_3 = 2.75448 \end{matrix} $$
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