Expression 8: "x" squared plus "y" squared plus "a" "x" plus "b" "y" plus "c" plus "f" "x" plus "g" "y" plus "h" equals 0x2+y2+ax+by+c+fx+gy+h=0
8
Expression 9: "x" squared plus "a" "x" plus "b" "y" plus "c" minus left parenthesis, "y" squared plus "f" "x" plus "g" "y" plus "h" , right parenthesis equals 0x2+ax+by+c−y2+fx+gy+h=0