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Re: Q: Factor with Polynominals?

• To: mathgroup at smc.vnet.net
• Subject: [mg26703] Re: [mg26672] Q: Factor with Polynominals?
• From: BobHanlon at aol.com
• Date: Thu, 18 Jan 2001 00:57:11 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

I don't believe that there is a universal method; however, for the specific 
example given:

expr = 3 x^2 + 3 y^2 + x + y^3 + y x^2;

Simplify[expr /. x^2 -> (r^2-y^2)] /. r^2 -> (x^2 + y^2)

x + (y + 3)*(x^2 + y^2)

Bob Hanlon

In a message dated 2001/1/17 1:18:10 AM, robert.schuerhuber at gmx.at writes:

>i'd like to factor polynominals, e. g. if i have an exspression like
>
>3 x^2 + 3 y^2 + x + y^3 + y x^2,
>
>i'd like to get (i want to factor x^2+y^2):
>
>(x^2+y^2)  (3 + y) + x.
>
>how can i achieve a result like this (also with other, more complicated
>polynominals)?
>