"f(x,y) = 2x^2 + xy - y^2 - x. Which of the following statements is true?" (A) "f(x,y) has a min at (-2/7, 1/7)"
"f(x,y) = 2x^2 + xy - y^2 - x. Which of the following statements is true?" (A) "f(x,y) has a min at (-2/7, 1/7)"
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:"f(x,y) = 2x^2 + xy - y^2 - x. Which of the following statements is true?"
(A) "f(x,y) has a min at (-2/7, 1/7)"
B "f(x,y) has a max at (2/7, -1/7)"
(C) "f(x,y) has a saddle at (2/9, 1/9)"
D) "f(x,y) has a saddle at (-1/7, 2/7)"
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