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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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