Solve the following difference equation using Z-transforms. a.) y(k) + 3y(k 1) + 2y(k 2) = x(k 1) + 3x(k 2) Given x(k) = u(k) and y(-1) = 1, y(-2) = 2 b.) y(k +1) y(k) = k^2 ; y(0) = 1
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