Question: Let be a symmetric 2 Ã 2 matrix. Prove that A is positive definite if and only if a > 0 and det A >

Let Let be a symmetric 2 × 2 matrix. Prove that A

be a symmetric 2 × 2 matrix. Prove that A is positive definite if and only if a > 0 and det A > 0.-- (a-2)~ ax + 2bxy + dy = x + -y a'

-- (a-2)~ ax + 2bxy + dy = x + -y a'

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