RE: [math-fun] Quintic equation

Thanks Fred for your help. I didn't know this Halley's method, and it works very well for this equation, in very few steps. Excellent!!! Your link doesn't work. The correct one is without www: http://digilander.libero.it/foxes/poly/Polynomial_zeros.pdf And a summary here: http://mathworld.wolfram.com/HalleysMethod.html Christian.