On Sep 8, 2:50 am, "Jon G." <jon8...@peoplepc.com> wrote:
> roots to 4th, 5th, 6th & 7th degree polynomials
>
> http://mypeoplepc.com/members/jon8338/math/id19.html
>
> The best I can promise is all denominators are nonzero, and dimensional
> analysis passes.
>
> See if you can understand the concept.  If it works, it can find the roots
> to any degree polynomial.  If it doesn't, then at best it may give a rough
> estimate.
>
> --
> Jon Giffen
> jon8...@peoplepc.com

Have you tried the formulae for a variety of polynomials.

Your cubic might be right; the quartic is probably wrong since a
resolvent cubic is needed and you do not have one; for higher degrees,
Abel's theorem says "Nope!"