$$1+21x+88x^2+845x^3 = 0$$
Answer
$$ \begin{matrix}x_1 = -0.05345 & x_2 = -0.02535+0.14663i & x_3 = -0.02535-0.14663i \end{matrix} $$
Explanation
$$ \begin{aligned} 1+21x+88x^2+845x^3 &= 0&& \text{simplify left side} \\[1 em]845x^3+88x^2+21x+1 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
This page was created using
Polynomial Equations Solver