(x + y)² - (2x + y)(-x + y)
x²+2xy+y²- (-2x²+2xy-xy+y²)
x²+2xy+y²+2x²-2xy+xy-y²
3x²+xy
x(3x+y)
x²+2xy+y²-(-2x²+xy+y²)=
x²+2xy+y²+2x²-xy-y²
3x²+xy=
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Verified answer
(x + y)² - (2x + y)(-x + y)
x²+2xy+y²- (-2x²+2xy-xy+y²)
x²+2xy+y²+2x²-2xy+xy-y²
3x²+xy
x(3x+y)
x²+2xy+y²-(-2x²+xy+y²)=
x²+2xy+y²+2x²-xy-y²
3x²+xy=
x(3x+y)