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References for more details:
* http://www.google.com/search?q=quartic+equation
* http://en.wikipedia.org/wiki/Quartic_equation
* http://mathworld.wolfram.com/QuarticEquation.html
* http://www.sosmath.com/algebra/factor/fac12/fac12.html
]]]
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.
* http://www.google.com/search?q=quartic+equation
* http://en.wikipedia.org/wiki/Quartic_equation
* http://mathworld.wolfram.com/QuarticEquation.html
* http://www.sosmath.com/algebra/factor/fac12/fac12.html
In practice, numerical solutions are found rather than using a
closed form formula.
Related: Quintic equation