The function f(x,y)=xy(1−5x−4y)   has 4 critical points. List them and select the type of critical point.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter9: Multivariable Calculus
Section9.3: Maxima And Minima
Problem 1YT
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The function

f(x,y)=xy(1−5x−4y)
 
has 4 critical points. List them and select the type of critical point.
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