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MathGroup Archive 2005

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Re: solve for a squared variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60459] Re: [mg60424] solve for a squared variable
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 16 Sep 2005 05:36:37 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

As the error message states, x^2 is not a variable (Symbol)

x^2/.Solve[x^2+y==1,x] // Union

{1-y}

z /. Solve[x^2+y==1/.x^2->z,z]

{1-y}


Bob Hanlon

> 
> From: "Ruth Lazkoz" <ruth.lazkoz at ehu.es>
To: mathgroup at smc.vnet.net
> Date: 2005/09/16 Fri AM 03:49:04 EDT
> Subject: [mg60459] [mg60424] solve for a squared variable
> 
> Hi everyone,
> 
> Why does 
> 
> Solve[x^2 + y == 1, x^2] 
> 
> give and error message? How can I solve for x^2?
> 
> Thanks,
> 
> Ruth 
> 
> 


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