Question: For f ( x , y ) , Find all values of x and y such that f x ( x , y ) =

For f(x,y), Find all values of x and y such that fx(x,y)=0 and fy(x,y)=0 simultaneously.
f(x,y)=x2+5xy+y2-25x-31y+6
(x,y)=
For f ( x , y ) , Find all values of x and y such

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