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7. Find and classify all critical points of the function f(x, y, z, w) = x2+ 5 -y' + 322 + w' + 3xy +

7. Find and classify all critical points of the function f(x, y, z, w) = x2+ 5 -y' + 322 + w' + 3xy + 6xz + 5xw + 4yz + 2yw +5x - 3y + 6w. 2 Note that your solutions might not be integers

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