The transfer function of an unstable system is given \(H\left( z \right) = \frac{1}{{1 - 1.5{z^{ - 1}} - 3{z^{ - 2}}}}\). The system may be stabilized by using a feedback system of the form G(z) = K z-2. The value of K is:
1
K > 2
2
1 < K < 2
3
K < 3.5
4
3.5 < K < 4