16. Let f(x, y, z) = x + 2xy - 3z2. Find the direction vector 
along which the directional derivative 
at the point (1, 0, 4) reaches its maximum. 
=_________
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16. Let f(x, y, z) = x + 2xy - 3z2. Find the direction vector along which the directional derivative at the point (1, 0, 4) reaches its maximum. =_________