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If z = x2 − xy + 7y2 and (x, y) changes from (3, −1) to...

If z = x2 − xy + 7y2 and (x, y) changes from (3, −1) to (2.96, −1.05), compare the values of Δz and dz. (Round your answers to four decimal places.)

dz =
Δz =
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