I highlighted what I'm having trouble with on the 4.pdf file. Even with the graph of my graphing software, I would put the exact same notation (used graphing software after doing my work to see where I was wrong but I seem to be right according to my software). I attached my work as the mywork.pdf file as well as the graph of the original function (f(x)=(4x^2)/(x^2 - 9)) as Graph.png.

The intervals I'm suggesting are:

Increasing on:

Decreasing on:

Why am I wrong?

Any help would be greatly appreciated!

Thanks in advance!