Question: For a surface function below: z = f (x, y) = x 2 + y 2 - 2 xy - x + 3 y +

For a surface function below:

 

z = f (x, y) = x 2 + y 2 - 2 xy - x + 3 y + 4

 

Find the directional derivative at the point (2, 3) in the direction of the vector   v = 5 i + 10  j .

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