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Use differentials to approximate the change in z for the given change in the Independent variables. 2 = x2 - 7xy + y when (x,y)

Use differentials to approximate the change in z for the given change in the Independent variables. 2 = x2 - 7xy + y when (x,y) changes from (4,4) to (4.04.3.9?) dz = E (Type an integer or a decimal.)

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