Factor completely the following questions: Note: If a question cannot be factored, state "prime" or "non-factorable" and explain the reason why.

1) ²+421

2) ²9+10

3) ²++20

4) ²+56²

5)2²98²

6)1211+2²

7)3⁴8³+4²

8)9²+ 42 15²

9)32⁴³+ 16m³⁴+ 2²⁵