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Radical conjugates


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




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