Simplify the following: (x+y) (2x+y)+(x+2y)(x-y)
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Answer:
Step-by-step explanation:
(x+y) (2 x+y) + (x+2 y) (x-y)
2 x² + x y + 2 x y + y² + x² - x y + 2 x y - 2 y²
3 x² - y² + 4 x y
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