SOLUTION: the sum of the first n terms of a series is 5n^2-2n. the r-1 term is

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Question 1125262: the sum of the first n terms of a series is 5n^2-2n. the r-1 term is
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
HINT :  The (r-1)-th term is equal to


the sum of the first (r-1) terms  MINUS  the sum of the first (r-2) terms, i.e.


5*(r-1)^2-2*(r-1)                  -       (5*(r-2)^2-2*(r-2)).


Based on this hint, you can complete the assignment on your own by simplifying this expression.