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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:

   1/(Sqrt[x]+2)

How?

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
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University of Massachusetts                413 545-2859 (W)
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Amherst, MA 01003-9305


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