I'll just tell you how to do it. I ain't gona do your homework for ya.
Eg:
(x-2)^2
1) Take the first number (which in this case is x. It might be 2x, depends on the question) and square it. so you get x^2.
2) Take the 2nd number, multiply it by the first number (in this case, its 2 because 2 x 1 is 2 (remember the invicible 1 in front of the 'x'), and multiply the answer by 2 (always 2, it does not change). So the answer is 4.
3) take the second number and square it. The answer... 4.
Now put them together... X^2 - 4X + 4
If you can't understand the above instuctions, then you need help.