Question: For the MA(2) polynomial b(L) = 1 + b1L + b2L2 with b2 > 0, there is a range of values of b1 such that

For the MA(2) polynomial b(L) = 1 + b1L + b2L2 with b2 > 0, there is a range of values of b1 such that the moduli of the two roots are equal and constant. For example, with b2 = 0.8, the moduli are 1.118 for −1.78 < b1 < 1.78. Explain.

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