Compute the convolution y[n] = x[n] * h[n] a) for (x[n])=(1, 2, -1, 0.3) and (h[n]) = (-1, -2, 2, 1} b) for (x[n]) (2, 0, -3, 1) and (h[n]) = (1, 0, 2, -1}