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Re: How to solve this equation?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg103529] Re: How to solve this equation?
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Sun, 27 Sep 2009 07:30:01 -0400 (EDT)

On 9/26/09 at 6:13 AM, j_ariai at hotmail.com (Jamil Ariai) wrote:

>Can anyone tell me how to solve a^{-x}+b^{-x}+c^{-x}==0 for x, where
>a and b and c are some constants.

If a, b and c are given specific numerical values, then you can
use FindRoot to get a numerical value for x. But if what you
want is a symbolic answer for x you need to understand there is
no general closed form solution. Also, even when using FindRoot
you may not have success.



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