Let f (x, y, z) be a function such that : (i) the function f (x, y, z) decreases most rapidly at the point P(1, 2, 2) in the direction of the vector (8,-4, -1). (ii) the Minimum rate of change of f (x, y,z) at the point P is -18. Find the directional derivative of f (x,y,z) at the point P in the direction from the point P towards the point Q(-1,0, 3).

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