Question: Select the answer 2. Let f(x, y, z) = 5x3 + 4xy y2 + 3z2. What is the directional derivative Dvf(1, 2, 3) of f

Select the answer 2. Let f(x, y, z) = 5x3 + 4xy y2 + 3z2. What is the directional derivative Dvf(1, 2, 3) of f at (1, 2, 3) (2) in the direction of v = 4, 8, 1? A. 18 B. 2 C. 23 9 D. 23

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