Question: If z = 7 x 2 + y 2 and ( x , y ) changes from ( 1 , 1 ) to ( 1

If z=7x2+y2 and (x,y) changes from (1,1) to (1.05,1.1), compare the values of z and dz.
dz=
z=
If z = 7 x 2 + y 2 and ( x , y ) changes from ( 1

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