Plug in an odd integer; in this case 3
(2*3) = 6 Even
(3*3)-1 = 8 Even
(5*3)+6 = 15 + 6 = 21 Odd
3+3^2 = 3 + 9 = 12 Even
(6*3)-6 = 18 - 6 = 12 Even
If x is an odd integer, which of the following is an odd integer?
  2x
  3x-1
  5x+6
  x+x^2
  6x-6