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MathGroup Archive 2007

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Re: Factorizing...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74142] Re: [mg74080] Factorizing...
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 12 Mar 2007 22:07:02 -0500 (EST)
  • Reply-to: hanlonr at cox.net

expr=2+Sqrt[5];

expr==Simplify[((1+Sqrt[5])/2)^3]

True

Last[Reduce[{x^3==expr,x>0},x]]^3

(1/8)*(1 + Sqrt[5])^3


Bob Hanlon

---- Bruno Campanini <BC at gmail.com> wrote: 
> How can I get it from Mathematica:
> 
> Factor[2+SQR(5)] = ((1+SQR(5))/2)^3
> 
> ???
> 
> Bruno



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