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This is my last attempt pls help me If z = x2 - xy + 4y and (x, y) changes from (1, -1) to (0.97,

This is my last attempt pls help me

If z = x2 - xy + 4y and (x, y) changes from (1, -1) to (0.97, -0.95), compare the values of Az and dz. dz = -0.34 X AZ = -0.527 X

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