$$x^3+4x^2+10 = 0$$
Answer
$$ \begin{matrix}x_1 = -4.49494 & x_2 = 0.24747+1.47088i & x_3 = 0.24747-1.47088i \end{matrix} $$
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