Help with this last algebra problem please! :D

Question

anonymous · Answer

f(x) = x^2 - 9 = (x + 3)(x - 3) 
Graph this 2nd degree function. Identify which function you used & the key feature of your graph. Explain how to find them algebraically.
Using your graph, describe if the average rate of change is increasing or decreasing, from left to right. Justify your observations with calculations.

anonymous · Answer

well
$$3\times-3$$ would equal -9
$$3-3$$ would equal 0

anonymous · Answer

and I think the average rate of change would be increasing, and moving left, but im not sure

anonymous · Answer

oh and 0 would be the second degree function, but you should ask someone else.

anonymous · Answer

Okay thanks for your help