0 votes 0 votes The directional derivative of $f\left ( x, y, z \right ) = 4x^{2}+2y^{2}+z^{2}$ at the point $(1, 1, 1)$ in the direction of the vector $\vec{v} = \hat{i} - \hat{k}$ is _________________ (rounded off to two decimal places). Others gatech-2022 numerical-answers + – Arjun asked Feb 15, 2022 edited Mar 1, 2022 by soujanyareddy13 Arjun 4.7k points answer See all 0 reply