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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?
>