Factorising the Difference of Two Squares

Question 1:

x2 25
x + 5 x 5

Question 1:

x2 4
x + 2 x 2

Question 1:

x2 81
x + 9 x 9

Question 1:

x2 196
x + 14 x 14

Question 1:

9 x2 64
3 x + 8 3 x 8

Question 1:

25 x2 1
5 x + 1 5 x 1