Me! i really need this for a quick thing with my algebra

3) complete the square and write the following in vertex form.
x2 - 8x + 12

4) determine the factors
x2y + 3x2 + 3y + 9

5)
write a polynomial that is a difference of two squares and describe how to factor it completely. identify the zeros of the equation and the x-intercepts.

6) write the polynomial that these are the factors for. (hint: multiply the factors)
(3x - 7)(2x - 3y)