Factorising the Difference of Two Squares

Question 1:

x2 − 4
x + 2 x − 2

Question 1:

x2 − 9
x + 3 x − 3

Question 1:

x2 − 16
x + 4 x − 4

Question 1:

x2 − 225
x + 15 x − 15

Question 1:

25 x2 − 16
5 x + 4 5 x − 4

Question 1:

16 x2 − 81
4 x + 9 4 x − 9