A unity, negative feedback system has a nonlinear function y = f(e) = e2, as shown in

Question:

A unity, negative feedback system has a nonlinear function y = f(e) = e2, as shown in Figure E2.1. For an input r in the range of 0 to 4, calculate and plot the open-loop and closed-loop output versus input and show that the feedback system results in a more linear relationship.
Figure E2.1
Open and closed loop.