Re: rationalize numerator of quotient

*To*: mathgroup at smc.vnet.net*Subject*: [mg81138] Re: rationalize numerator of quotient*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Fri, 14 Sep 2007 03:26:35 -0400 (EDT)*Organization*: Uni Leipzig*References*: <fcb3ok$fjj$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

Hi Murray, expr = (Sqrt[x] - 2)/(x - 4); Factor[expr, Extension -> Sqrt[2]] Regards Jens Murray Eisenberg wrote: > I have a quotient such as: > > (Sqrt[x] - 2)/(x-4) > > I want to "rationalize the numerator" by multiplying numerator and > denominator each by Sqrt[x] + 2 so as to obtain result: > > 1/(Sqrt[x]+2) > > How? >