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. f(x,y) = -7x² + 3xy- 18y² - 9x +9y-2 ...

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