Find the derivative of the function at P0 in the direction of u.
-$$f ( x , y , z ) = 4 x + 8 y - 7 z , \quad P _ { 0 } ( - 7,10 , - 10 ) , \quad \mathbf { u } = 3 \mathbf { i } - 6 \mathbf { j } - 2 \mathbf { k }$$
A) $\frac { 2 } { 7 }$
B) $\frac { 10 } { 7 }$
C) $- \frac { 46 } { 7 }$
D) $- \frac { 22 } { 7 }$

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The Answer of Find the derivative of the function at P0 in the direction of u.
-$$f ( x , y , z ) = 4 x + 8 y - 7 z , \quad P _ { 0 } ( - 7,10 , - 10 ) , \quad \mathbf { u } = 3 \mathbf { i } - 6 \mathbf { j } - 2 \mathbf { k }$$
A) $\frac { 2 } { 7 }$
B) $\frac { 10 } { 7 }$
C) $- \frac { 46 } { 7 }$
D) $- \frac { 22 } { 7 }$

Find the Derivative of the Function at P0 in the Direction