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2. (2a-3b)(2a-3b-(a+b)) = (2a-3b)(2a-a-3b-b) = (2a-3b)(a-4b)
atau
(3-4y+z).(a-b)
(2a-3b)² - (2a.a+2a.b+(-3b).a+(-3b).b))
=(3a-3b)² - (2a²+2ab-3ab-3b²)
= (3a-3b)² - (2a²-3b²-ab)