It's not even a complete solution which is roots for a ninth-degree polynomial. Approximation with quadratics is what makes it feasible with some caveats [1].

It's not even a complete solution which is roots for a ninth-degree polynomial. Approximation with quadratics is what makes it feasible with some caveats [1]. [1] https://youtu.be/OmfliNQsk88?t=19m7s https://youtu.be/OmfliNQsk88?t=19m7s