Expression 4: "h" left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis left brace, "f" left parenthesis, "x" , right parenthesis greater than or equal to 0 , right bracehx=fxfx≥0
4
Expression 5: "j" left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis left brace, "f" left parenthesis, "x" , right parenthesis less than 0 , right bracejx=fxfx<0