Factorize :
6a²+2ab+9b²
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(1)2M-3N=2×(a²-2ab-b²)-3×(2a²-ab-3b²)=2a²-4ab- 2b²-6a²+3ab+9b²=-4a²-ab+7b² (2)2(M-2N)-4(2M-N)=2M-4N-8M+4N=-6M=-6(a²-2ab-b²)=-6a²+12ab+6b²
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