Re: FindRoot

*To*: mathgroup at smc.vnet.net*Subject*: [mg98719] Re: FindRoot*From*: dh <dh at metrohm.com>*Date*: Fri, 17 Apr 2009 04:26:00 -0400 (EDT)*References*: <gs6pg3$h2f$1@smc.vnet.net>

Hi Miguel, divide your equation by a^3 and solve for y=x/a: Reduce[y^3 - 4 y - 2 == 0, y] // N and you see that all 3 roots are real. Daniel Miguel wrote: > Hi all, > How can I to find the reals roots of a cubic equation in simbolic > form: For example, > > Find the roots of > x^3-4a^2x-2a^3==0 > > where "a" is real and a>0. > > Thanks >