(a) Consider discrete-time signals x [n] and x [n] respectively given as x [n] = 28[n+ 2] + u[n] - u[n - 2], x [n]u[n 1] - u[n 2] + 28[n - 3]. and (i) (ii) Sketch the waveforms of x [n] and x [n]. Find the convolution x [n] * x [n]. (b) Consider continuous-time signals x (t) and x (t) respectively given as (t+1 x (t) = 2 0 1 t < 0 0 < t < 2, otherwise x (t) = u(t) - u(t - 2). Find the convolution x(t) * x(t). (5 marks) (10 marks) (15 marks)