Re: Possibly related to my post "Unexpected Graph Output"...
- To: mathgroup at smc.vnet.net
- Subject: [mg125494] Re: Possibly related to my post "Unexpected Graph Output"...
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Thu, 15 Mar 2012 00:35:09 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
On 3/14/12 at 12:41 AM, jwkochanski at mymail.vcu.edu (James Kochanski)
wrote:
>Why does Mathematica think the cube root of -27 is 1.5 + 2.598076 I
>and not -3?
Because Mathematica uses complex variables and the value returned is a complex cube root of -27.
That is:
In[8]:= NSolve[x^3 == -27, x]
Out[8]= {{x->-3.},{x->1.5 -2.59808 I},{x->1.5 +2.59808 I}}