Using matlab

Given the transfer function G(s) = s + b/s^2 + as + b; a. Use an input R(s) = unit-step, evaluate percent overshoot, settling time, peak time, and rise time for the following values: a = 4; b = 25. Also, plot the poles and zeros. b. Use an input R(s) = unit-step, evaluate percent overshoot, settling time, peak time, and rise time for the following values: a = 15; b = 100. Also, plot the poles and zeros. Discuss the effects of pole location upon the time response for questions 2 and 3