Re: (-8)^(1/3)

*To*: mathgroup at smc.vnet.net*Subject*: [mg31319] Re: (-8)^(1/3)*From*: "Angel E. Andreu" <aandreu at localnet.com>*Date*: Sat, 27 Oct 2001 01:08:37 -0400 (EDT)*References*: <9rb6rm$5ch$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Using Mathematica v.4: When I enter (-8)^(1/3) I received: 2(-1)^(1/3) Given that you wrote your Mathematica response as 1 + 1.73205i, reminds one of solving the cubic equation: x³ + 8 = 0. Thus, here are some commands that yield your desired result of -2: In[1]:= Solve[x³ +8 = = 0] [[1]] Out[1] {x -> -2} or In[2]:= Root[ #1^3 + 8&, 1] Out[2] -2 A² LuisMa wrote: > When I enter > > (-8)^(1/3) > > Mathematica answer > > 1 + 1.73205i, > > but I need > > (-8)^(1/3) = -2 > > How can I get it? -- ----------------------------------------------------- Click here for Free Video!! http://www.gohip.com/free_video/