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