[ -2 ] 
0 |-> 1 |-> -2
f(z) = 3/2*z^3 - 9/2*z + 1
*
[ -1/2 ] 
0 |-> 1 |-> -1/2
f(z) = -6*z^3 + 9/2*z + 1
*
TOTAL: 2