(a-4b)(2a+3b)-(a+2b)(a-b)

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(a-4b)(2a+3b)-(a+2b)(a-b)
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(a-4b)(2a+3b)-(a+2b)(a-b)
(a-4b)(2a+3b)-(a+2b)(a-b)

(a-4b)(2a+3b)-(a+2b)(a-b)

(a-4b)(2a+3b)-(a+2b)(a-b)
=2a²+3ab-8ab-12b²-(a²-ab+2ab-2b²)
=2a²-5ab-12b²-a²-ab+2b²
=2a²-a²-5ab-ab-12b²+2b²
=a²-6ab-10b²