Okay, I hope this isn't one too many problems. So here's the problem with each of them.

(Factor completely)

1.

So far I've gotten to...

And I'm at a pause there.

(Factor trinomial)

2.

Not sure if this is right.

I have no clue whatsoever on how to solve this one.

(Factor)

3.

Likewise.

(Factor by grouping)

4.