Please help me with this

Part 1 of 2 O Points: 0 of 1 Compute the directional derivative of the following function at the given point P in the direction of the given vector. Be sure to use a unit vector for the direction vector 2 3 f(x,y) =v25 -x2 - 5y ; P(5, - 5), 13 1 13 Find the gradient of f(x,y) = V25 -x2 - 5y Vi(x,y)=