$$2x^3+x-8 = 0$$
Answer
$$ \begin{matrix}x_1 = 1.48257 & x_2 = -0.74129+1.46578i & x_3 = -0.74129-1.46578i \end{matrix} $$
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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