(x+2y)²-(x-2y)(x+y)

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(x+2y)²-(x-2y)(x+y)

(x+2y)²-(x-2y)(x+y)
(x+2y)²-(x-2y)(x+y)

(x+2y)²-(x-2y)(x+y)
(x+2y)²-(x-2y)(x+y)
=x²+4xy+4y²-﹙x²+xy-2xy-2y²﹚
=x²+4xy+4y²-x²+xy+2y²
=5xy+6y²