(x-4y)(2x+3y)-(x+2y)(x-y)

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(x-4y)(2x+3y)-(x+2y)(x-y)(x-4y)(2x+3y)-(x+2y)(x-y)(x-4y)(2x+3y)-(x+2y)(x-y)2x²+3xy-8xy-12y²

(x-4y)(2x+3y)-(x+2y)(x-y)
(x-4y)(2x+3y)-(x+2y)(x-y)

(x-4y)(2x+3y)-(x+2y)(x-y)
2x²+3xy-8xy-12y²-(x²-xy+2xy-2y²)
=x²-6xy-10y²