Question

20) If the directional derivative of $= ax^2y + by²z+cz^2x at (1, 1, 1) has maximum
x-1/2=y-3/-2=z
magnitude 15 in the direction parallel to the line
find a, b and c.
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Answer 1

Answer:a=20/9 , b=-55/9 ,

c =50/9

explained in attachment