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Compute the directional derivative of the function f(x,y) = - xy + y at the point P(0, - 9) in the direction of the vector (9,8). The directional derivative is

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter3: Functions And Graphs

Section3.3: Lines

Problem 21E

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Question

Find the directional derivative

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Compute the directional derivative of the function f(x,y) = - xy +y at the point P(0, - 9) in the direction of the vector (9,8).
The directional derivative is
(Type an exact answer using radicals as needed.)

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