Vector calculus. Divergent vector field.

[carstensentyl]

I don't even know where to start this one. I can do all the other problems in the section, but this one makes no sense

 

[EngageEngage]

a). since you've done the other problems, you surely saw some gradients and divergences. The easiest way to do this is piece by piece. First take the gradient of f to get a vector field. Then simply apply div to this vector field to get the answer.

once you get this you will see the answer for part b

 

[ice109]

um just do what it says? what part are you having trouble with?

 

[HallsofIvy]

I agree with ice109- if the problem asks you to find "div grad f", I would recommend that you first find the grad of f and then the div of that! I am assuming that, since you were given a problem like this, you know what "div" and "grad" are.