Question

factorise by using identities -
(a+2b)²-9c² ​

Answer 1

Answer:

(a+2b+3c)(a+2b-3c)

Step-by-step explanation:

Identity - $a^2-b^2 = (a+b)(a-b)$

$(a+2b)^2-9c^2\\= (a+2b)^2-(3c)^2\\= (a+2b+3c)(a+2b-3c)$