Find the local maximum, and minimum value and saddle points of the function.
$$f ( x , y ) = x ^ { 2 } - x y + y ^ { 2 } - 9 x + 6 y + 9$$

Name: Find the local maximum, and minimum value and saddle points of the function. \[f ( x , y ) = x ^ { 2 } - x y + y ^ { 2 } - 9 x + 6 y + 9\]
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The Answer of Find the local maximum, and minimum value and saddle points of the function.
$$f ( x , y ) = x ^ { 2 } - x y + y ^ { 2 } - 9 x + 6 y + 9$$

Find the Local Maximum, and Minimum Value and Saddle Points f(x,y)=x2−xy+y2−9x+6y+9f ( x , y ) = x ^ { 2 } - x y + y ^ { 2 } - 9 x + 6 y + 9f(x,y)=x2−xy+y2−9x+6y+9

Find the Local Maximum, and Minimum Value and Saddle Points $f ( x , y ) = x ^ { 2 } - x y + y ^ { 2 } - 9 x + 6 y + 9$