completely factor each polynomial using appropriate method.

11. x²+7x+10
12. x²+7x+12
13.x²-16
14. 100-s²
15. 2x²+14x+20
16. y²-25
17. y²+8y+20
18. y²+2y-15
19. y²-12y+36
20.3y⁴-75​