Re: Simplify exponents in output
- To: mathgroup at smc.vnet.net
- Subject: [mg99236] Re: [mg99155] Simplify exponents in output
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 30 Apr 2009 06:25:12 -0400 (EDT)
- Reply-to: hanlonr at cox.net
expr = (64 x^9)^(1/3)
4*(x^9)^(1/3)
Assuming[{x >= 0}, Simplify[expr]]
4*x^3
Simplify[expr, x >= 0]
4*x^3
{expr, 4 x^3} /. x -> 3
{108, 108}
{expr, 4 x^3} /. x -> -3
{108*(-1)^(1/3), -108}
% // N
{54.000000000000014 +
93.53074360871936*I, -108.}
Bob Hanlon
---- davef <davidfrick2003 at yahoo.com> wrote:
=============
When I attempt to solve the following in Mathematica:
(64 x^9)^(1/3)
I get this:
4 (x^9)^1/3
Why don't I get:
4x^3
IOW, why doesn't Mathematica simplify the variable under the radical in the output?
I am using Mathematica 7.
Thanks.