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Re: Simplifying radicals

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122254] Re: Simplifying radicals
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Sat, 22 Oct 2011 06:08:31 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j7p1s8$5ko$1@smc.vnet.net>

On Oct 20, 2:49 pm, Tom De Vries <tidetable... at gmail.com> wrote:
> Hi,  I'm working with some introductory topics in radicals.
>
> I know that Mathematica assumes things about the domain used in
> problems,  so the principal cube root of a negative number will be
> complex... or something like that..
>
> I'm way down at the lower high school level simply working with cube
> roots of negative numbers and wanting a negative number result.
>
> I know there are ways of using assumptions and solving over the reals, etc.
>
> Is there any EASY way I can simply ask for the cube root of -729 and get -9?
>
> TOM

Apart from my original reply I would strongly suggest the following
thread:

http : // groups.google.com/group/comp.soft - sys.math.mathematica/
browse_thread/thread/403 b579399a8b61/d057e0af1e2a5474?lnk = gst & q principal + cube + root # d057e0af1e2a5474

Regards
Dimitris



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