Answer:
5. [tex]a ( x + y^{2} + z )[/tex]
6. [tex]2a ( x + y + z)[/tex]
7. [tex]4 ( x +4y)[/tex]
8. [tex]-5 ( x + y )[/tex]
9. [tex]7a ( a + b)[/tex]
10. [tex]-2 ( x + 2y + 3z)[/tex]
11. [tex]bx ( a + y)[/tex]
12. [tex]-x (x^{2} + x + 1)[/tex]
this took long but i hope the answers are correct :)
