Find a vector u € R' such that, at the point (2, 1, -1), the function f(, v, 2) =-y + 2a2 + has its greatest rate of increase in the direction of u. Ou-(-4, 2, 1) (8,-3,-2) Ou= (3, -2, -8) u= (8, -3, 2) O None of the others

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A: Solving by linear combination method

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