Factories: 4a 2

We have, 4a 2 – 9 = (2a) 2 – (3) 2 By using the formula a 2 – b 2 = (a + b)(a – b) We get, 4a 2 – 9 = (2a) 2 – (3) 2 = (2a + 3)(2a – 3)

We have,

4a² – 9

= (2a)² – (3)²

By using the formula a² – b² = (a + b)(a – b)

We get,

4a² – 9 = (2a)² – (3)²

= (2a + 3)(2a – 3)