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The sum of first n term of an arithmetic sequence is3n^2-6nCalculate first term and common difference |
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Answer» Step-by-step EXPLANATION: Sn=3n²-6n If n=1, then S1=3(1)²-6(1)=-3 If n=2, then S2=3(2)²-6(2) =3(4)-6(2)=12-12=0 A2=S2-S1=0-(-3)=3 S1=A=-3 d=a2-a1=3-(-3)=3+3=6. pls MARK as brailiest. |
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