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Re: Factorizing...


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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