Question: If f ( x , y ) = x y , find the gradient vector gradf ( 5 , 4 ) . gradf ( 5

If f(x,y)=xy, find the gradient vector gradf(5,4).
gradf(5,4)=
Use the gradient vector to find the tangent line to the level curve f(x,y)=20 at the point (5,4).
If f ( x , y ) = x y , find the gradient vector

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