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3. For the model (1-B)(1-0.2B)Xr=(1-0.5B)at, find forecasts for one and two steps ahead, and show that a recursive expressions for forecasts three or more steps

3. For the model (1-B)(1-0.2B)Xr=(1-0.5B)at, find forecasts for one and two steps ahead, and show that a recursive expressions for forecasts three or more steps ahead is given by X, (k) = 1.2X, (4-1) -0.2X, (k-2)

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