Hello, i need some help with factorisation. I'm not sure how to factorise the following: a(x+y)^2 + b^2(x+y) help would be greatly appreciated :)

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Again x + y is the common term so factor this outside the parenthesis.  This leaves you: (x + y) [a(x + y) + b^2].  This can be simplified to: (x + y)[ax + ay + b^2]