We are given 

Firstly, we can find gradient 
so, we will find partial derivatives





now, we can plug point (-5,5,2)



so, gradient will be 

now, we are given that 
it is in direction of v=⟨−3,2,−4⟩
so, we will find it's unit vector 


now, we can find unit vector 

now, we can find dot product to find direction of the vector 

now, we can plug values


 .............Answer
.............Answer