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Re: Simplifying radicals

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  • Subject: [mg122254] Re: Simplifying radicals
  • From: dimitris <dimmechan at>
  • Date: Sat, 22 Oct 2011 06:08:31 -0400 (EDT)
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  • References: <j7p1s8$5ko$>

On Oct 20, 2:49 pm, Tom De Vries <tidetable... at> 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?

Apart from my original reply I would strongly suggest the following

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


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