Find the Products of the following
1. (2x - 3y)(2x + 3y)
2. (5x + 4y)(5x - 4y)
3. (x - 5)(x + 5)
4. (m + 3)(m + 6)
5. (2x - 4y)(6x - 3y)
6. (x + 3)(x2 - 3y +9)