Expression 8: "A" left parenthesis, "x" minus "x" Subscript, 0 , Baseline , right parenthesis squared plus "B" left parenthesis, "y" minus "y" Subscript, 0 , Baseline , right parenthesis squared minus "F" equals 0Ax−x02+By−y02−F=0
8
Expression 9: "x" Subscript, 0 , Baseline equals 1x0=1