Question: Please answer All part and show work. 3). Kindly find the Directional Derivative of f ( x,y, 2 ) = 4x 4 - 72 x

Please answer All part and show work.

3). Kindly find the Directional Derivative of f ( x,y, 2 ) = 4x 4 - 72 x + 42 at the point ( 2, 1, -1 ) in the direction of vector V = 31- 2 j+5k. Show your Gradient and use of Dot Product. Also Tell whether the function is increasing or decreasing in the direction of V

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