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MathGroup Archive 2007

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Re: rationalize numerator of quotient

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81165] Re: [mg81125] rationalize numerator of quotient
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 14 Sep 2007 03:40:38 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

y = (Sqrt[x] - 2)/(x - 4);

y // Simplify

1/(Sqrt[x] + 2)

y // Cancel

1/(Sqrt[x] + 2)

y // Apart

1/(Sqrt[x] + 2)


Bob Hanlon

---- Murray Eisenberg <murray at math.umass.edu> 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?
> 
> -- 
> Murray Eisenberg                     murray at math.umass.edu
> 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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