Factorising the Difference of Two Squares

Question 1:

x2 121
x + 11 x 11

Question 1:

x2 64
x + 8 x 8

Question 1:

x2 25
x + 5 x 5

Question 1:

x2 1
x + 1 x 1

Question 1:

4 x2 64
2 x + 8 2 x 8

Question 1:

25 x2 49
5 x + 7 5 x 7