Given that the directional derivative of $f ( x , y )$ at the point $( - 1,2 )$ in the direction of $\{ 3 , - 4 \}$ is $- 10$ and that $| \nabla f ( - 1,2 ) | = 10$ , find $\nabla f ( - 1,2 )$ .

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The Answer of Given that the directional derivative of $f ( x , y )$ at the point $( - 1,2 )$ in the direction of $\{ 3 , - 4 \}$ is $- 10$ and that $| \nabla f ( - 1,2 ) | = 10$ , find $\nabla f ( - 1,2 )$ .

Given That the Directional Derivative Of f(x,y)f ( x , y )f(x,y)

Given That the Directional Derivative Of $f ( x , y )$