Q188
The directional derivative of f(x, y, z) = 2x2 + 3y2 + z2 at the point P(2, 1, 3) in the direction of the vector a = i - 2k is
A.
-2.785
B.
-2.145
C.
-1.789
AnswerD.
1.000
Answer: Option C
Solution
Answer: Option C
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