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Examine the Function f(x,y)=x312xy+y3+4f ( x , y ) = x ^ { 3 } - 12 x y + y ^ { 3 } + 4

Question 85

Multiple Choice

Examine the function f(x,y) =x312xy+y3+4f ( x , y ) = x ^ { 3 } - 12 x y + y ^ { 3 } + 4 for relative extrema and saddle points.


A) saddle point: (0,0,4) ( 0,0,4 ) ; relative minimum: (4,4,60) ( 4,4 , - 60 )
B) relative minimum: (0,0,4) ( 0,0,4 ) ; relative maximum: (4,4,60) ( 4,4 , - 60 )
C) saddle points: (0,0,4) ( 0,0,4 ) , (4,4,60) ( 4,4 , - 60 )
D) saddle point: (4,4,60) ( 4,4 , - 60 ) ; relative minimum: (0,0,4) ( 0,0,4 )
E) relative minimum: (4,4,60) ( 4,4 , - 60 ) ; relative maximum: (0,0,4) ( 0,0,4 )

Correct Answer:

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