Examine the function for relative extremum and saddle point  (a) f(?; ?) = x2 − y2 − x − y  (b) f(x; y) = x2 - 3xy − y2

Algebra and Trigonometry (MindTap Course List)
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ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter2: Functions
Section2.4: Average Rate Of Change Of A Function
Problem 4.2E: bThe average rate of change of the linear function f(x)=3x+5 between any two points is ________.
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2. Examine the function for relative extremum and saddle point

 (a) f(?; ?) = x2 − y2 − x − y

 (b) f(x; y) = x2 - 3xy − y2

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