Question: If z = x 2 - xy + 3y 2 and (x, y) changes from (3, -1) to (2.96, 20.95), compare the values of Dz

If z = x2 - xy + 3y2 and (x, y) changes from (3, -1) to (2.96, 20.95), compare the values of Dz and dz.

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