Help me in this quesstion

The concentration of a harmful chemical in a region of R3 is given by the function x. 3:, Z) = 7x63 + 7yzz3xz3 In the direction of which vector v should one move off of P(4, 2, 2) to experience the most rapid decrease of the chemical's concentration initially? 93230 28616 Your last answer was interpreted as follows: v: [98280 28616 172] If one moves off of P at unit speed in the direction found above, what is the rate R of change of the chemical's concentration experienced initially? Hint: to say 2 type sqrt(2)