How to find direction from gradient?

[munkhuu1]

Homework Statement

if f(x,y,z) indicates electrical charge in the water at position(x,y,z) and
the gradient is <12,-20,5>, in which direction should the shark swim to find its prey?

Homework Equations

The Attempt at a Solution

is the answer in the direction of <12,-20,5>
im little confused when gradient is given and how to find direction? do i find unit vector of gradient or something?

 

[BruceW]

Yeah, the question is not very clear. I would guess that you have the right answer. Or maybe they want the unit vector, as you say.