Question

factorise this question plz

Answer 1

So easy,, let as question (9(x+1))^2+{2×5×9(x+1)(y+1)}+(5(y+1))^2 it is In the form a^2+b^2+2ab and can be written as (a+b)^2,so it can be written as [9(x+1)+5(y+1)]^2