For o fynction t4 suppose that Suppose and and Which is true for the points P(l,D and QC1,2) where of f- Pond are critical points

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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1) For a function \( f(x, y) \), suppose that
\[ f_{xx} = x^2 \text{ and } f_{yy} = y \text{ and } f_{xy} = 2. \]

Which is true for the points \( P(1,1) \) and \( Q(1,2) \) where \( P \) and \( Q \) are critical points of \( f \).

A. \( P \) is a local min and \( Q \) is a local max.  
B. \( P \) is a saddle point and \( Q \) is a local max.  
C. \( P \) is a local max and \( Q \) is a local min.  
D. \( P \) is a saddle point and \( Q \) is a local min.  
E. none of these.

---

This content can be used as part of a lesson or problem set on identifying the nature of critical points in multivariable calculus, using partial derivatives.
Transcribed Image Text:Transcription: --- 1) For a function \( f(x, y) \), suppose that \[ f_{xx} = x^2 \text{ and } f_{yy} = y \text{ and } f_{xy} = 2. \] Which is true for the points \( P(1,1) \) and \( Q(1,2) \) where \( P \) and \( Q \) are critical points of \( f \). A. \( P \) is a local min and \( Q \) is a local max. B. \( P \) is a saddle point and \( Q \) is a local max. C. \( P \) is a local max and \( Q \) is a local min. D. \( P \) is a saddle point and \( Q \) is a local min. E. none of these. --- This content can be used as part of a lesson or problem set on identifying the nature of critical points in multivariable calculus, using partial derivatives.
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