Question

Factorise 4a2−9 please help ​

Answer 1

4a² - 9

= (2a)² - (3)²

= (2a-3)(2a+3)

{ Since a² - b² = (a-b) (a+b) }

Answer 2

4

$4 {a}^{2?} - 9 \\ 4 {a}^{?2} + 6a - 6a - 9 \\ 2a ( 2a + 3) - 3(2a + 3) \\ (2a - 3)(2a + 3)$

is your answer