How would we solve this?

Suppose that as you move away from the point (2, 0, 2), the function f (x, y, z) increases most rapidly in the direction 0.65 + 0.8}, and the rate of increase of the function in this direction is 7. At what rate is the function increasing as you move away from the point (2, O, 2) in the direction f+3+1? SHOW WORK. (20)