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Multivariable & Vectoreasy
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If the gradient of a differentiable function f(x,y)f(x, y)f(x,y) at the point (1,2)(1, 2)(1,2) is ∇f(1,2)=⟨−3,4⟩\nabla f(1, 2) = \langle -3, 4 \rangle∇f(1,2)=⟨−3,4⟩, what is the directional derivative of fff at this point in the direction of the positive xxx-axis?