Let a be a real number and f(x, y) = 4ax?y+ 3xy³. Let v = 3i – j and let Vf(x, y) denote the gradient of f(x, y). i) Find Vf(1,1) in terms of a. -16/5 ii) If the rate of change of f(x, y) at the point (1, 1) in the direction of v is find a.

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