Factorising the Difference of Two Squares

Question 1:

x2 49
x + 7 x 7

Question 1:

x2 144
x + 12 x 12

Question 1:

x2 144
x + 12 x 12

Question 1:

x2 196
x + 14 x 14

Question 1:

4 x2 9
2 x + 3 2 x 3

Question 1:

4 x2 100
2 x + 10 2 x 10