Question: In each part, classify the quadratic form as positive definite, positive semidefinite, negative definite, negative semidefinite, or indefinite. (a) x21 + x22 (b) (x1 -

In each part, classify the quadratic form as positive definite, positive semidefinite, negative definite, negative semidefinite, or indefinite.
(a) x21 + x22
(b) (x1 - x2)2
(c) x21 - x22

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a Since x 1 2 x 2 2 0 unless x 1 x 2 0 the form is positive definite b ... View full answer

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