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N² +2n is the algebraic expression for sum of n termsof an arithmetic sequence when find the nth term of that sequence |
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Answer» Step-by-step EXPLANATION: Sn=N/2(2a-d+nd)=n²+2n n/2(2a-d+nd)=n(n+2) 2a-d+nd=2n+4 nd=2n......... d=2 2a-d=4 2a=6........ a=3 Tn=a+nd-d=3+3n-2=3n+1 |
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