请数学厉害的大神解(3x²-xy-2y²)-2(x²+xy-2y²)(3x²-xy-2y²)-2(x²+xy-2y²)

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请数学厉害的大神解(3x²-xy-2y²)-2(x²+xy-2y²)
(3x²-xy-2y²)-2(x²+xy-2y²)

(3x²-xy-2y²)-2(x²+xy-2y²)
=3x²-xy-2y²-2x²-2xy+4y²
=x²-3xy+2y²
=(x-y)(x-2y)