Find the Derivative of the Function at P0 in the Direction

question 150

Multiple Choice

Find the derivative of the function at P0 in the direction of u.
- $$f ( x , y ) = \ln ( x + 9 y ) , \quad P _ { 0 } ( 9 , - 9 ) , \quad u = 6 i + 8 j$$

• A) \(- \frac { 68 } { 45 }\)
• B) \(- \frac { 44 } { 45 }\)
• C) \(- \frac { 4 } { 3 }\)
• D) \(- \frac { 52 } { 45 }\)

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