9. Use Lagrange multipliers to find the given extremum. Assume that x and y are positive. Maximize f(x, y) = e Constraint x²+y?-8 = 0 a. f(2, 2) = e4 b. f(1, 1) = e! c. f(3, 1)= e d. f(4, 2) = e8 e. f(2, 1)= e?

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