$$1125-x^3+5x^2 = 0$$
Answer
$$ \begin{matrix}x_1 = 12.36184 & x_2 = -3.68092+8.80095i & x_3 = -3.68092-8.80095i \end{matrix} $$
Explanation
$$ \begin{aligned} 1125-x^3+5x^2 &= 0&& \text{simplify left side} \\[1 em]-x^3+5x^2+1125 &= 0&& \\[1 em] \end{aligned} $$
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