Expression 3: "f" Subscript, 3 , Baseline left parenthesis, "x" , right parenthesis equals "x" "f" Subscript, 2 , Baseline left parenthesis, "x" minus 1 , right parenthesis plus 1f3x=xf2x−1+1
3
Expression 4: "f" Subscript, 4 , Baseline left parenthesis, "x" , right parenthesis equals "x" "f" Subscript, 3 , Baseline left parenthesis, "x" minus 1 , right parenthesis plus 1f4x=xf3x−1+1
4
Expression 5: "f" left parenthesis, "x" , right parenthesis equals left brace, 0 less than or equal to "x" less than 1 : "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis , 1 less than or equal to "x" less than 2 : "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis , 2 less than or equal to "x" less than 3 : "f" Subscript, 3 , Baseline left parenthesis, "x" , right parenthesis , 3 less than or equal to "x" less than 4 : "f" Subscript, 4 , Baseline left parenthesis, "x" , right parenthesis , right bracefx=0≤x<1:f1x,1≤x<2:f2x,2≤x<3:f3x,3≤x<4:f4x