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Re: How to isolate the constant in a two variable equation?

• To: mathgroup at smc.vnet.net
• Subject: [mg113499] Re: How to isolate the constant in a two variable equation?
• From: Bill Rowe <readnews at sbcglobal.net>
• Date: Sun, 31 Oct 2010 02:08:47 -0500 (EST)

On 10/30/10 at 4:38 PM, emammendes at gmail.com (Eduardo M. A. M.Mendes)
wrote:

>Many thanks. It works too but it returns curly brackets.

If you want the actual number instead of a list use First, Last or Part. For example

Cases[4 X*X + 3 Y*Y + 2 X*Y + 1, _?(FreeQ[#, X | Y] &)][[1]]

or

Last@Cases[4 X*X + 3 Y*Y + 2 X*Y + 1, _?(FreeQ[#, X | Y] &)]

Bill