SOLUTION: The sum of the first n terms of an arithmetic sequence is (2n^2)-n. Find the general term and show that the sequence is an arithmetic sequence

Question 1011566: The sum of the first n terms of an arithmetic sequence is (2n^2)-n. Find the general term and show that the sequence is an arithmetic sequence
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
To find the sum of the first terms of an arithmetic sequence use the formula,

if , we have

....solve for the general term

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