Calculate the average rate of change for the function [math]f(x) = x^2 + 6x + 9[/math] between [math]x = 1[/math] and [math]x = 3[/math].

[list=1] [*]Evaluate the function for [math]x = 3[/math]. [*]Evaluate the function for [math]x = 1[/math]. [*]Use the average rate of change formula to determine the average rate of change between [math]x = 1[/math] and [math]x = 3[/math]. [/list]