Find the derivative of the function at P0 in the direction of u. f(x, y, z) = -9x + 3y + 8z, P 0(10, -6, 7), u = 3 i - 6 j - 2 k a) - 52/7 b) - 7 c) - 61/7 d) - 10

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A: The solution of the problem is given in the next steps.