book Maths Puzzle Numerical Ability

Factor each expression completely:
-21 a x3y3 - 28x3y4 + 7x2y3z

xy + 3y -6x -18

6a2 + 4bx - 15a-10b

16a2 + 8a - 15

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book Other Question

(3x-2)^2=9x^2-6. Did I do this problem right? I just want to make sure before I hand it in. dividing exponents answer following proplems

1. 10b/b^2=
2. p^2q^3=
3. 10^8/10^5=
4. 24b^3/12b^2=
5. ab^3/a^5
6. 24p^2qr/363pr^3