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cookiesyum
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Homework Statement
Classify the quadratic surface:
2x^2 + 4y^2 - 5z^2 + 3xy - 2xz + 4yz = 2
Homework Equations
A quadratic form is a second degree polynomial equation in three variables which has the form
F(x,y,z) = ax^2 + by^2 + cz^2 + 2dxy + 2exz + 2fyz
where coefficients a through i are real numbers.
The curve F(x,y,z) = j can be written in the form (x^T)*A*x = j where
x = [x, y, z]
A = [a, d, e]
[d, b, f]
[e, f, c]
The Attempt at a Solution
A = [2, 3/2, -1]
[3/2, 4, 2]
[-1, 2, -5]
Then, find the eigenvectors of A-tI...check how many are positive, negative, or 0 and classify using the information? Is that the right way to proceed?