Question

Simplify (x+2y) (-3x-y) - (x+y) (x-y) + (x-2y) (-2x+y)
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Answer 1

(x+2y)(-3x-y)-(x+y)(x-y)+(x-2y)(-2x+y)

=-3x²-xy-6xy-2y²-x²+y²-2x²+xy+4xy-2y²

=-6x²-3y²-2xy