The maximum value of f(x)=2x3 – 9x2 +12x - 3 in the interval 0 x 3 = = is _______. The z-transform of the sequence x[n] is given by ( ) ( )2 1 1 X z , 1 2z- = - , with the region of convergence z 2. Then, x 2 > [ ] is ______.