Use the array method (discussed in class: this is similar to the graphical method of text example 10.2) to compute the convolution y[n] = x[n]*h[n], where (a) x[n] = {-1, 3, 4, -2} and h [n] = {1, 2, -2, 3, -2}. (b) Text problem 10.12 (d). In each case, verify your answer using the Matlab “conv” function (see code snippet on page 503 of text or class example for MATLAB code: for the convolved sequence, pay careful attention to its time index).