Q235
The directional 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 \[ a = 3 i - 4 j\] is
The directional 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 is
A.
-4
B.
-2
AnswerC.
-1
D.
1
Answer: Option B
Solution
Answer: Option B
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