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rationalize numerator of quotient

  • To: mathgroup at
  • Subject: [mg81125] rationalize numerator of quotient
  • From: Murray Eisenberg <murray at>
  • Date: Thu, 13 Sep 2007 06:27:39 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • Reply-to: murray at

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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