Factorising the Difference of Two Squares

Question 1:

x2 225
x + 15 x 15

Question 1:

x2 64
x + 8 x 8

Question 1:

x2 49
x + 7 x 7

Question 1:

x2 4
x + 2 x 2

Question 1:

16 x2 16
4 x + 4 4 x 4

Question 1:

25 x2 49
5 x + 7 5 x 7