Question

What is the fractorization 9a² - 225?

Answer 1

Hey!!!

We have 9a² - 225 = 0

=> 9a² = 225
=> a² = 25
=> a = 5 or a = -5

Hope this help

Answer 2

It can be written in the form of 
(3a)^2-(15)^2
here u can use identity 
a
(a+b)(a-b)
so,(3a+15)(3a-15)