Q153
For a scalar function f(x, y, z) = x2 + 3y2 + 2z2, the directional derivative at the point P(1, 2, -1) in the direction of a vector \[ i - j + 2 k \] is
For a scalar function f(x, y, z) = x2 + 3y2 + 2z2, the directional derivative at the point P(1, 2, -1) in the direction of a vector is
A.
-18
B.
-3√6
AnswerC.
3√6
D.
18
Answer: Option B
Solution
Answer: Option B
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