The reflection coefficients for a two-pole model of a

Question

The reflection coefficients for a two-pole model of a signal x(n) are r₁ = 0.25 and r₂ = 0.25 and the "modeling error" is ?₂ = 9.

(a) If r_x (3) = 1 find the modeling error, ?₃, for a three-pole model.

(b) If the signal values, x(n), are multiplied by 1/2, i.e., y(n) = 0.5x(n), find the reflection coefficients and the modeling error for a two-pole model of y(n).