Help with rational expressions plz

If anybody could help, I have a math exam tomorrow, and I'm working on the review...but I've been having alot of trouble. Usually I can figure this stuff out by studying my notes...but I'm at a loss. Any help would be appreciated. The first three are problems that I don't understand, the rest are ones that I've completed, but I'm not sure if they're right.

1.

2. Solve by quadratic formula:

3. Solve by completing the square:

And the ones that I've completed, but not sure if they're right...I would appreciate if you could check these out.

1.

I got:

2.

I got:

3.

I got: