Question

factorise
9a^2-(a^2-4)^2

Answer 1

Hello Mate!

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

Hope it helps☺!

Ping me out for any confusion

@Shuchi111