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Directional Derivative

  1. Jun 7, 2010 #1
    nvmnd - solved
    Last edited: Jun 7, 2010
  2. jcsd
  3. Jun 7, 2010 #2
    Hey karens,

    Well you have the formula written above. Why don't you start by showing us what [tex]f_x (2,1), f_y (2,1)[/tex] are and what [tex]a, b[/tex] should be considering your unit vector [tex]\left(\frac{3}{5}, \frac{-4}{5}\right)[/tex].
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