Aerospace Engineering > GATE 2019 > Partial Derivatives
A scalar function is given by f(x, y) = x2 + y2. Take î and ĵ as unit vectors along the x and y axes, respectively. At (x, y) = (3, 4) the direction along which f increases the fastest is _______.
A
(1/5)(4î - 3ĵ)
B
(1/5)(3î - 4ĵ)
C
(1/5)(3î + 4ĵ)
D
(1/5)(4î + 3ĵ)

Correct : c

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