Question 722872
Look at the common variables. Add those up together and you will have a problem that looks like 2a^2+10a. This should be easier to factor. There is no way your right to do the grouping on this problem. Teachers are tricky they will bring things back in your present homework that was from the past lesson to make sure you still remember. Now, if I'm wrong I owe you a donut and I would say ask your teacher before class or after to explain it either in a different way or again. 

Spoiler here is how I did the whole problem:
2a^2+3a+6a+a
2a^2+10a
2a(a+5)