Question

Factorise the following​

Answer 1

$4 {a}^{2} b - 9b {}^{2} \\ b(4 {a }^{2} - 9b)$

Answer 2

Answer:

4a²b - 9b³

= b(4a² - 9 b²)

= b{(2a)² - (3b)²}

= b{(2a + 3b)(2a - 3b)}

[since, a² - b² = (a + b )(a - b)

hope it helps you!!