(i) 4x = 52² - 48²

4x = (52 – 48) (52 + 48)

4x = 4 × 100

4x = 400

x = 100

(ii)

14x = (47 – 33) (47 + 33)

14x = 14 × 80

x = 80

(iii)

Using formula:

a² – b² = (a – b) (a + b), we get

5x = (50 – 40) (50 + 40)

5x = 10 × 90

5x = 900

x = 180