Discover a wealth of knowledge and get your questions answered at IDNLearn.com. Whether it's a simple query or a complex problem, our community has the answers you need.

Determine if a lower approximation is valid. Justify your answer. If a lower order approximation is valid, use it to calculate the settling time (for 1st order approximations), or the settling time and the overshoot (for 2nd order approximations). Consider unit step input.
G(s)= 12.3 / (s^3+23.85s^2 +176.4s +1692)