This isn't the place to get answers for your homework, so I won't give them to you. But I will help you understand how to answer these questions yourself.
The only concept that needs addressing in this answer is how to expand brackets.
With addition, brackets can be removed with not problem. So,
With subtraction, we have to be a bit more careful. When expanding a bracket with a minus sign before it, we have to remember the sign of each term changes (because we multiply it by
The final thing to mention is that when bringing like terms together, we use the sign that comes before the terms and not the operation. So,