Question: Let f be a function of two variables that has continuous partial derivatives and consider the points A (4,9), B (7,9), C (4,13), and D

Letfbe a function of two variables that has continuous partial derivatives and consider the pointsA(4,9),

B(7,9),

C(4,13),

andD(16,18).

The directional derivative offatAin the direction of the vectorAB

is8and the directional derivative atAin the direction ofAC

is14. Find the directional derivative offatAin the direction of the vectorAD.

(Round your answer to two decimal places.)

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