Invisible a écrit :
> Le_Forgeron wrote:
> 
>> Solving Third & Fourth degres polynomials is known since a long time (I
>> have a book with that which was printed in the 60')
> 
> I'll bet to hell nobody actually *uses* the formulas above though. (!)
> 

Probably not.  If you consider that most - if not all - computers 
calculate square roots by using an iterative method, it would probably 
be faster to use it on the original polynomial than to use it 8 times on 
smaller polynomials, as in the solution you linked to.

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