Question: Let f be a function of two variables that has continuous partial derivatives and consider the points A ( 3 , 4 ) , B

Let f be a function of two variables that has continuous partial derivatives and consider the points
A(3,4),
B(4,4),
C(3,9),
and
D(8,16).
The directional derivative of f at A in the direction of the vector
AB
is 8 and the directional derivative at A in the direction of
AC
is 13. Find the directional derivative of f at A in the direction of the vector
AD.
(Round your answer to two decimal places.)

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