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