Use the Limit Definition of the Partial Derivative to Compute $\text { Find } \frac { \partial f } { \partial x } \text { at the point } ( 4 , - 4 ) : f ( x , y ) = 3 - 8 x y + 8 x y ^ { 2 }$

Use the limit definition of the partial derivative to compute the indicated partial derivative of the function at the specified point.
- $\text { Find } \frac { \partial f } { \partial x } \text { at the point } ( 4 , - 4 ) : f ( x , y ) = 3 - 8 x y + 8 x y ^ { 2 }$