Question

factorize
9a^2-(a^2-4)^2
​

Answer 1

Answer:

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

(3a)^2 - ( a^2 -4)^2

by using identity x^2 - y^2=(x+y)(x-y)

(3a+a^2-4)(3a-a^2+4)