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fy(x,y)=0f _ { y } ( x , y ) = 0

Question 10

Multiple Choice

 For f(x,y) =17x312xy+y3 find all values of x and y such that fx(x,y) =0 and \text { For } f ( x , y ) = 17 x ^ { 3 } - 12 x y + y ^ { 3 } \text { find all values of } x \text { and } y \text { such that } f _ { x } ( x , y ) = 0 \text { and } fy(x,y) =0f _ { y } ( x , y ) = 0 simultaneously.


A) (0,0) ,(4172/3,4171/3) ( 0,0 ) , \left( - \frac { 4 } { 17 ^ { 2 / 3 } } , - \frac { 4 } { 17 ^ { 1 / 3 } } \right)
B) (0,0) ,(4172/3,4171/3) ( 0,0 ) , \left( \frac { 4 } { 17 ^ { 2 / 3 } } , \frac { 4 } { 17 ^ { 1 / 3 } } \right)
C) (0,0) ,(4171/3,4171/3) ( 0,0 ) , \left( - \frac { 4 } { 17 ^ { 1 / 3 } } , \frac { 4 } { 17 ^ { 1 / 3 } } \right)
D) (0,0) ,(4171/3,4171/3) ( 0,0 ) , \left( - \frac { 4 } { 17 ^ { 1 / 3 } } , - \frac { 4 } { 17 ^ { 1 / 3 } } \right)
E) (0,0) ,(4171/3,4171/3) ( 0,0 ) , \left( \frac { 4 } { 17 ^ { 1 / 3 } } , - \frac { 4 } { 17 ^ { 1 / 3 } } \right)

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