Multiple choice

The directional derivative of the scalar function f(x, y, z) = x2 + 2y2 + z at the point P = (1, 1, 2) in the direction of the vector $\bar{a}=3\hat{i}-4\hat{j}$ is

  1. -4

  2. -2

  3. -1

  4. 1
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B Correct answer
Explanation

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