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Re: transposing an equation

• To: mathgroup at smc.vnet.net
• Subject: [mg26258] Re: transposing an equation
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Sun, 10 Dec 2000 00:19:33 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <90kq3d$r25@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

Solve[y==a x^2 + b x +x,x]

?

InverseSeries[a  x^2 + b  x + c + O[x]^3, y]

General it is not possible for an exact polynom to revert
the equation y= a x^2+b*x+c into
x=A*y^2+B*y+C.

Regards
  Jens

Christopher Deacon wrote:
> 
> Suppose y=a x^2+b x +c.
> 
> How can I get Mathematica to solve for x (i.e., x=Ay^2+By+C) and give me the
> values for the constants A,B,C?
> 
> Chris