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Math Help - gradient

  1. #1
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    gradient

    Consider the surface .
    A. Find the unit normal vector to the surface at the point with positive first coordinate.
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  2. #2
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    Quote Originally Posted by wvlilgurl View Post
    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.
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