I'm stuck on these problems, can anyone help me? Thanks.

1. 8x^{3}- 56x^{2}+ 80x

2.4v^{2}+ 9v + 5

3. 5c^{2 }- 18c - 8

4. 56b^{2 }+ 23b - 63

5. 6a^{4 }+ 5a^{2}-25

6. 3b^{3}- 9b^{2}- 54b

Factoring GCF:

7.3x^{8}y^{6}+ 6x^{6}y^{5}+24xy