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rationalize numerator of quotient

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:



Murray Eisenberg                     murray at
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

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