-9+6b-b²=-(9-6b+b)²=-(3-b)(3-b)
-12ab-3a²-12b²=-3(a²+4ab+4b²)=-3(a+2b)(a+2b)
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-9+6b-b²=-(9-6b+b)²=-(3-b)(3-b)
-12ab-3a²-12b²=-3(a²+4ab+4b²)=-3(a+2b)(a+2b)