Find the impulse responses of the systems described by these equations.


(a) y[n] = x[n] ? x[n ? 1]

(b) 25y[n] + 6y[n ? 1] + y [n ? 2] = x[n]

(c) 4y[n] ? 5y[n ? 1] + y [n ? 2] = x[n]

(d) 2y[n] + 6y [n ? 2] = x[n] ? x [n ? 2]






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