Suppose that the maximum rate of change of f at $( 1 - 1 )$ is 20, and it occurs in the direction of $5 \vec { i } - 5 \vec { j }$ .Find $\nabla f ( 1 , - 1 )$ , $f _ { x } ( 1 , - 1 )$ , and $f _ { y } ( 1 , - 1 )$ .

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The Answer of Suppose that the maximum rate of change of f at $( 1 - 1 )$ is 20, and it occurs in the direction of $5 \vec { i } - 5 \vec { j }$ .Find $\nabla f ( 1 , - 1 )$ , $f _ { x } ( 1 , - 1 )$ , and $f _ { y } ( 1 , - 1 )$ .

Suppose That the Maximum Rate of Change of F At (1−1)( 1 - 1 )(1−1)

Suppose That the Maximum Rate of Change of F At $( 1 - 1 )$