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The direction derivative of the scalar function f(x, y, z) = x2 + 2y2 + z at the point P = (1, 1, 2) in the direction of the vector 
  • a)
    -4
  • b)
    -2
  • c)
    -1
  • d)
    1
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The direction derivative of the scalar function f(x, y, z) = x2 + 2y2 ...
Since,


At (1, 1, 2)

So, direction derivative of at P(1, 1, 2) in direction of 

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Most Upvoted Answer
The direction derivative of the scalar function f(x, y, z) = x2 + 2y2 ...
Since,


At (1, 1, 2)

So, direction derivative of at P(1, 1, 2) in direction of 

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The direction derivative of the scalar function f(x, y, z) = x2 + 2y2 + z at the point P = (1, 1, 2) in the direction ofthe vectora)-4b)-2c)-1d)1Correct answer is option 'B'. Can you explain this answer?
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