Question

pleease tell me how to factor out it​

Answer 1

Answer:

I hope it will help you.

Answer 2

$9 - 2 ^{2} \times 5 ^{n} \times 5 ^{n} \\ 9 - 4 \times 25 {n}^{2} \\ 5 \times 25 {n}^{2} = 125 {n}^{2}$

I hope it is right