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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

> 




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