Question

simplify (x+y) (2x+y) + (x+2y) (x-y)​

Answer 1

$(x+y) (2x+y) + (x+2y) (x-y) \\ {2x}^{2} + xy + 2xy + {y}^{2} + {x}^{2} - xy + 2xy - {2y}^{2} \\ by \: adding \\ {3x }^{2} + 4xy - {y}^{2}$

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Answer 2

Answer:

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