Need help finding the product of polynomials using special products! Help ASAP!:/?

I can't find anything on the internet that has helped me and I'm really pressed for time to finish my online work, it's polynomials using special products, I need to solve the following problems:

1. (w+x)(w+x)

2. (y-x)(y-x)

3. (wx-y)^2

4. (x+2y)^2

5. (4x^3+7y^3z^4)^2

6. (2x-1/2)^2

7. (0.1x+0.4y)^2

8. (2a^x+1/2b^x)^2

9. (3x^2a -4y^az^3a)^2

10. (x+1)(x-1)

11. (x+y)(x-y)

12. (a+b)(a-2b)

Thank you so very much in advance!!