Re: fourth degree equation

quasi <quasi@xxxxxxxx> writes:

On Mon, 04 Jun 2007 20:51:37 -0700, drc1@xxxxxxxxxxxx wrote:

What is the solution for x^4 - x + a = 0. (Solve for x in terms of a.)

It's not pretty.


Perhaps you'd find this series form pretty:

x = sum_{j=0}^infinity (4j choose j)/(3 j + 1) a^(3j+1)
--
Robert Israel israel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia Vancouver, BC, Canada
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