(a-2b)(3a+b)²+(a+3b)²(2b-a)
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(a-2b)(3a+b)²+(a+3b)²(2b-a)(a-2b)(3a+b)²+(a+3b)²(2b-a)(a-2b)(3a+b)²+(a+3b)&
(a-2b)(3a+b)²+(a+3b)²(2b-a)
(a-2b)(3a+b)²+(a+3b)²(2b-a)
(a-2b)(3a+b)²+(a+3b)²(2b-a)
(a-2b)(3a+b)²+(a+3b)²(2b-a)
=(a-2b)((3a+b)²-(a+3b)²)
=(a-2b)((9a²+6ab+b²)-(a²+6ab+9b²))
=(a-2b)(9a²+6ab+b²-a²-6ab-9b²)
=(a-2b)(8a²-8b²)
=8(a-2b)(a-b)(a+b)