Let's just dive right in!

What can you undistribute (no, that's not a real word) in this?

If you don't believe me, distribute
the 2 back in to see if it works.

This is one of the main games of factoring -- undistributing things. We'll call it "taking out" or "factoring out."

What can we take out of this?

OK, now check this guy out -- and be careful! Always distribute to check it.