分解因式，只要答案，急，给分

1.(x-4)^2-(x+4)^2
=(x-4+x+4)(x-4-x-4)
=2x*-8
=-16x

2.(a^2-3a)^2-2(a^2-3a)-8
=(a^2-3a-4)(a^2-3a+2)
=(a-4)(a+1)(a-1)(a-2)

3.3ax^2+6axy+3ay^2
=3a(x^2+2xy+y^2)
=3a(x+y)^2

4.2ax^2-10ax-100a
=2a(a^2-5x-50)
=2a(a-10)(a+5)

5.2x^2-6x-8
=2(x^2-3x-4)
=2(x-4)(x+1)

6.-a^2x^2+6a^2x-9a^2
=-a^2(x^2-6x+9)
=-a^2(x-3)^2

1:-16x
2:(a-1)(a-2)(a+1)(a-4)
3:3a(x+y)^2
4:2a(x+5)(x-10)
5:2(x+1)(x-4)
6:-a^2(x-3)^2