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(Solved): Consider the following. \[ f(x, y)=4 x-7 y \] (a) Find \( f(8,9) \) and \( f(8.1,9.05) \) and calc ...



Consider the following.
\[
f(x, y)=4 x-7 y
\]
(a) Find \( f(8,9) \) and \( f(8.1,9.05) \) and calculate \( \Delta z \).
\[
\b

Consider the following. \[ f(x, y)=4 x-7 y \] (a) Find \( f(8,9) \) and \( f(8.1,9.05) \) and calculate \( \Delta z \). \[ \begin{array}{r} f(8,9)= \\ f(8.1,9.05)= \\ \Delta z= \end{array} \] (b) Use the total differential \( d z \) to approximate \( \Delta z \).


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We have to find the required value from given function is f(x,y)=4x?7y
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