Expression 2: "g" left parenthesis, "x" , right parenthesis equals "f" left parenthesis, 60 , right parenthesis plus "f" prime left parenthesis, 60 , right parenthesis left parenthesis, "x" minus 60 , right parenthesis plus 1 half "a" Subscript, "b" , Baseline left parenthesis, "x" minus 60 , right parenthesis squared left brace, 60 less than or equal to "x" less than or equal to 100 , right bracegx=f60+f′60x−60+12abx−60260≤x≤100