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Re: Matrix Form of Quadratic Equations

• To: mathgroup at smc.vnet.net
• Subject: [mg114230] Re: Matrix Form of Quadratic Equations
• From: Jean Pellegri <Jean.Pellegri at wanadoo.fr>
• Date: Sun, 28 Nov 2010 06:52:36 -0500 (EST)

In : Reduce[ForAll[{x, y}, {x, y}.{{a, b}, {b, d}}.{x, y} == x^2 + y^2 - 2 x y], {a, b, d}, Reals]

Out : a == 1 && b == -1 && d == 1