Given the following LTID system: y[n]+2y[n1]+y[n2]=2x[n]x[n1]withx[n]=(3)nu[n],y[1]=2andy[2]=3 a) Use MATLAB to solve for the zero-input response of this system. Display and plot the result for n=2 to n=20. b) Write a MATLAB program to find and plot the impulse response for n=2 to n=20. c) Write a MATLAB program to find and plot the total response of this system for n=2 to n=20