Find all relative extrema and saddle points of the function. Use the Second Partials Test where applicable. (If an answer does not exist, enter DNE.) f(x, y) = -x2 - 2y2 + 4x - 4y - 11 relative minimum (x, y, z) = relative maximum (x, y, z) = saddle point (x, y, z) = (|

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