Chapter 4 - An Introduction to Functions - 4-3 Patterns and Nonlinear Functions - Practice and Problem-Solving Exercises - Page 251: 23

B

Graphing this function shows that it is nonlinear so it eliminates A and C. By plugging in the values we see that function B fits the graph. Another way to do this is that the function graph looks like a parabola and looks like the graph of $y=x^2$ but only shifted down and function B is a $y=x^2$ graph shifted down.