$$100x^3-25x^2+98000 = 0$$
Answer
$$ \begin{matrix}x_1 = -9.85025 & x_2 = 5.05012+8.60152i & x_3 = 5.05012-8.60152i \end{matrix} $$
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