Factorising the Difference of Two Squares

Question 1:

x2 25
x + 5 x 5

Question 1:

x2 25
x + 5 x 5

Question 1:

x2 100
x + 10 x 10

Question 1:

x2 9
x + 3 x 3

Question 1:

25 x2 100
5 x + 10 5 x 10

Question 1:

4 x2 9
2 x + 3 2 x 3