The graph of f(x,y)=y2-x2 on XYZ space has a saddle point (a,b) if... choice: (choose one correct answer) D(a,b)>0 and fxx(a,b)>0  D(a,b)>0 and fxx(a,b)<0  D(a,b)=0  D(a,b)<0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 40RE
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The graph of f(x,y)=y2-x2 on XYZ space has a saddle point (a,b) if...

choice: (choose one correct answer)

  1. D(a,b)>0 and fxx(a,b)>0
  2.  D(a,b)>0 and fxx(a,b)<0
  3.  D(a,b)=0
  4.  D(a,b)<0
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