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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