Need help for a simple equation
- To: mathgroup at smc.vnet.net
- Subject: [mg12813] Need help for a simple equation
- From: Tae-Wan Kim <tae-wan.kim at sdrc.com>
- Date: Fri, 12 Jun 1998 04:05:43 -0400
- Organization: SDRC
- Sender: owner-wri-mathgroup at wolfram.com
Hello, I need your help to solve a simple equation. My problem is as follows: f(x, y) = a x^2 + b xy + c y^2 + d x + e y + f = 0 (1) partial derivative of f(x,y) with respect to x: dfx(x, y) = 2 a x + b y + d = 0 (2) I'd like to solve (1) and (2) using Mathematica. I get two set of roots: (x_0, y_0) and (x_1, y_1) I programmed as sollows: SetAttributes[a, Constant] SetAttributes[b, Constant] SetAttributes[c, Constant] SetAttributes[d, Constant] SetAttributes[e, Constant] SetAttributes[f, Constant] f[x_, y_] := a x^2 + b xy + c y^2 + d x + e y + f dfx = D[f[x,y], x] -> this didn't work I don't know what to do here. Could you please tell me Mathematics program to solve this problem? Thank you. Best regards, Tae-wan Kim SDRC
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