Question: A 3 D scalar field i s given b y f ( x , y , z ) = x 2 + 9 x y

A3D scalar field is given byf(x,y,z)=x2+9xy-2xz2. Find the unit vector hat(n)
along which the derivative off, evaluated at(x,y,z)=(2,4,8)isof greatest magnitude.
A 3 D scalar field i s given b y f ( x , y , z )

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