References for more details:
An equation of the form $ax^4+bx^3+cx^2+dx+e=0$

Like the Quadratic Equation and the Cubic Equation, the Quartic Equation has a closed form solution. This was first found by Ferrari, then stolen and published by Cardano.

In practice, numerical solutions are found rather than using a closed form formula.

Related: Quintic equation

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