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2. Show that the function z = f(x, y) = 2x2 +y + 3ry -3y - 5x + 8 has a single critica (stationary) point

2. Show that the function z = f(x, y) = 2x2 +y + 3ry -3y - 5x + 8 has a single critica (stationary) point at = -1 and y = 3 and that is a saddle (10 points)

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