(3a-2)[4a²+(2a-b)(-2a-b)]

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(3a-2)[4a²+(2a-b)(-2a-b)]
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(3a-2)[4a²+(2a-b)(-2a-b)]
(3a-2)[4a²+(2a-b)(-2a-b)]

(3a-2)[4a²+(2a-b)(-2a-b)]
原式=(3a-2)[4a²+(-b+2a)(-b-2a)]
=(3a-2)[4a²+(-b)²-(2a)²]
=(3a-2)(4a²+b²-4a²)
=b²(3a-2)
=3ab²-2b²

原式=(3a-2)[4a²-(2a-b)(2a+b)]
= (3a-2)[4a²-(4a²-b²)]
=(3a-2)b²
=3ab²-2b²