Determining the Directional Derivative

1. Oct 4, 2008

cse63146

[SOLVED]Determining the Directional Derivative

1. The problem statement, all variables and given/known data

Find the following directional derivative of the following function in the direction of the given vector v

$$f(x,y) = x^5 y^3 + 8 \\\ v = (-4,3)$$

2. Relevant equations

$$\nabla_u f\left(x,y,z\right) = \frac{1}{\left|\bold{u}\right|}\left(\frac{\partial f}{\partial x}u_x + \frac{\partial f}{\partial y}u_y + \frac{\partial f}{\partial z}u_z\right)$$

3. The attempt at a solution

EDIT: nevermind, got it.

Last edited: Oct 4, 2008