Edit made on November 02, 2008 by derekcouzens at 13:41:45
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An equation of the form EQN:ax^4+bx^3+cx^2+dx+e
An equation of the form EQN: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