\[\text { If } z = x ^ { 2 } - x y + 7 y ^ { 2 } \text { and } ( x , y ) \text { changes from } ( 2,1 ) \text { to } ( 1.85,1.05 ) \text { find } d z \text {. }\]

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Question 1

Question 1

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$\text { If } z = x ^ { 2 } - x y + 7 y ^ { 2 } \text { and } ( x , y ) \text { changes from } ( 2,1 ) \text { to } ( 1.85,1.05 ) \text { find } d z \text {. }$

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