Expression 2: "f" left parenthesis, "x" , right parenthesis equals 0.5 2 3 "x" to the 4th power plus 0.5 3 2 "x" cubed plus 0.0 6 7 "x" squared plus 0.9 3 4 "x"fx=0.523x4+0.532x3+0.067x2+0.934x
2
Expression 3: 0.3 "x" to the 4th power plus "x"0.3x4+x
3
Expression 4: 0.5 "x" to the 4th power plus 0.5 "x" cubed plus "x"0.5x4+0.5x3+x