$$x^3-4x^2+3x+12 = 0$$
Answer
$$ \begin{matrix}x_1 = -1.25265 & x_2 = 2.62632+1.63772i & x_3 = 2.62632-1.63772i \end{matrix} $$
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