Question: For f(x, y) = A (x 2 + Bx + y 2 + Cy), what values of A, B, and C give f a

For f(x, y) = A − (x2 + Bx + y2 + Cy), what values of A, B, and C give f a local maximum value of 15 at the point (−2, 1)?

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