These are some problems I'm doing to review for a test, and I wanna check some of my answers.

You have to factor completely. (^ refers to raising to a certain power. For example x^2 means x to the second power.)

1.) 16x^2 + 8x^4y^2 - 12xy^5

2.) x^2 + 3x +12

3.) c^2 - 18c + 81

4.) x^4 - 4x^3 + x^2 - 4x

5.) 10a^2 + 11^a + 3

6.) b^4 + 4b^2 + 4b

7.) 2y^3 - 7y^2 - 15y

8.) 8r^3 + t^3

9.) 5y^2 - 22y + 8

You just have to factor completely, for example, the answer to number 3 would be.......... (c - 9)^2.

If anyone could solve any of these, it'd be really helpful!