Find the roots of the characteristic equation of the following ARMA models: (a) ((1-6 B) z_{t}=a_{t}); (b)

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Find the roots of the characteristic equation of the following ARMA models:

(a) \((1-6 B) z_{t}=a_{t}\);

(b) \(\left(1-1.4 B+0.8 B^{2}\right) z_{t}=a_{t}\);

(c) \(\left(1-0.6 B+1.2 B^{2}\right) z_{t}=(1-\) \(0.5 B) a_{t}\).

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