(a+2b)²-a²-2ab=

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(a+2b)²-a²-2ab=(a+2b)²-a²-2ab=(a+2b)²-a²-2ab=(a+2b)²-a²-2ab=

(a+2b)²-a²-2ab=
(a+2b)²-a²-2ab=

(a+2b)²-a²-2ab=
(a+2b)²-a²-2ab
=a^2+4ab+4b^2-a^2-2ab
=2ab+4b^2