Find the Derivative of the Function at P0 in the Direction

question 159

Multiple Choice

Find the derivative of the function at P0 in the direction of u.
- $$f ( x , y ) = - 3 x ^ { 2 } - 10 y , \quad P _ { 0 } ( - 8 , \quad ) , \quad \mathbf { u } = 3 \mathbf { i } - 4 \mathbf { j }$$

• A) 56
• B) \(\frac { 328 } { 5 }\)
• C) \(\frac { 184 } { 5 }\)
• D) \(\frac { 232 } { 5 }\)

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