Expression 3: "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis times "f" left parenthesis, "x" , right parenthesis times left parenthesis, 3 minus 2 times "f" left parenthesis, "x" , right parenthesis , right parenthesisf2x=fx·fx·3−2·fx