# Thread: Vector Analysis

1. ## Vector Analysis

Hi
The following question how would i start it:

Find the maximum rate of change of $\phi$ at the point (2,1,1) for the function $\phi$= 2x+y-z

P.S

2. Originally Posted by Paymemoney
Hi
The following question how would i start it:

Find the maximum rate of change of $\phi$ at the point (2,1,1) for the function $\phi$= 2x+y-z

P.S
Evaluate $\nabla \phi(2, 1, 1)$. Your class notes or textbook should clearly tell you this. If you need more help, please show all your work and say where you are stuck.