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
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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