Question 5: Factorize 
Factorization exercises —
Solution:
Given expression is

Can be written as;
%5E2%2B(9)%5E2)
Adding and subtracting
;
%5E2%2B2(2x%5E2)(9)%2B(9)%5E2-2(2x%5E2)(9))
First three terms are of
. so;
%5E2-36x%5E2)
Taking whole square of second term as well;
%5E2-(6x)%5E2)
This is now
form, so;
(2x%5E2%2B9-6x))
Rearranging;
(2x%5E2-6x%2B9))
Is the factorization!