Consider the surface .
A. Find the unit normal vector to the surface at the point with positive first coordinate.

2. Originally Posted by wvlilgurl
Consider the surface .
A. Find the unit normal vector to the surface at the point with positive first coordinate.
z = f(x, y) = 32/(xy).

Evaluate $f_x$ and $f_y$.

A normal vector is $(f_x, \, f_y, \, -1)$.

Substitute x = 4 and y = 4. Get a unit vector from this in the usual way.