Radical conjugates

*To*: mathgroup at smc.vnet.net*Subject*: [mg129691] Radical conjugates*From*: Francisco Javier García Capitán <garciacapitan at gmail.com>*Date*: Mon, 4 Feb 2013 01:21:57 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

Hello, I wanted a function that takes a numerical expression of the form a + b Sqrt[c] or a Sqrt[b] + c Sqrt[d] and returns its conjugate, namely a - b Sqrt[c] and (a Sqrt[b] - c Sqrt[d]) respectively. I wrote RadicalConjugate[x_] := Module[{c}, c = Cases[x, Power[_]]; If[Length[c] > 0, x /. c[[1]] -> -c[[1]], x] ] and it seems that it works. Anyway, do you have a different approach? Thank you. -- --- Francisco Javier Garc=EDa Capit=E1n http://garciacapitan.99on.com

**Follow-Ups**:**Re: Radical conjugates***From:*Bob Hanlon <hanlonr357@gmail.com>