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3a2+9 find the GCF
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\[3a ^{2}+9\]has only one factor in common between the two parts there. There is no a with the 9, so it can't be an a, but 3 goes into 3 and it also goes into 9. Factor out a 3, and what are you left with?\[3(a ^{2}+3)\]
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