Find all points (x, y) where f (x, y) has a possible relative maximum or minimum. Then, use the second-derivative test to determine, if possible, the nature of f (x, y) at each of these points. If the second-derivative test is inconclusive, so state.

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17.2 f(x, y) = ¹7x² + 2xy + 5y² + 5x − 2y + 2 4