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Re: solve for a squared variable

• To: mathgroup at smc.vnet.net
• Subject: [mg60493] Re: solve for a squared variable
• From: Bill Rowe <readnewsciv at earthlink.net>
• Date: Sun, 18 Sep 2005 01:15:49 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

>ruth.lazkoz at ehu.es (Ruth Lazkoz) wrote:

>Why does

>Solve[x^2 + y == 1, x^2]

>give and error message? 

Becuase Solve expects a variable as the second argument and you have supplied an expression that is a function of a variable.

>How can I solve for x^2?

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