The general matrix form:

superscriptT(vector(x,y,1))*matrix(3,3,A,B/2,D/2,B/2,C,E/2,D/2,E/2,F)*vector(x,y,1)=0

A=slider([-2,2])

B=slider([-2,2])

C=slider([-2,2])

D=slider([-2,2])

E=slider([-2,2])

F=slider([-2,2])

Graph of the formula

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