can you show some workings too please that would be great :):)

1) (q+4)(q+5) expand and simplify i got - q(squared)+9q+20

simplified 9q(cubed) + 20

2) expand and simplify (2k - 3m)(3k+2m) help?

3) Solve 5(x+1)=3x + 12

4)facotorise x(squared) + 5x + 4

5) rearrange the forumla to make x the subject y = b- ax(squared)

5) solve x(squared) + 5x + 4 = 0