Could anyone please solve these quadratic equations real quickly please?

1. (x+1)(x+2)

2. (x+2)(x-1)

3. (x-1)(x-2)

4. (x+3)(x-3)

5. (x-7)squared

6. xsquared + 4x + 3

7. xsquared + 7x + 12

8. xsquared - 5x + 4

9. xsquared + 21x + 20

10. xsquared + 2x - 15

11. xsquared - x - 12

12. xsquared + 5x - 36