I REALLY need help with these problems.. its factoring polynomial equations.. and i kinda understand how to do it BUT these problems are just way over my head would love some help plz here they are

1. 8X^3 - 27 = 0

2. X^3 - 3X^2 = 16x - 48

3. X^4 - 2X - 8 = 0

4. 16X^4 - 1 = 0

5. -3X^3 - 18X^2 + 27X + 162 = 0

These are the 5 problems that i cant seem to solve... plz help would appreciate it alot