SOLUTION: find the formula for the partial sum of the first n termsof the following sequence -2+0+2+4+...+(2n-4)

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Question 612396: find the formula for the partial sum of the first n termsof the following sequence
-2+0+2+4+...+(2n-4)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi, 



find the formula for the partial sum of the first n termsof the following sequence

-2+0+2+4+...+(2n-4)

Note: S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2

S%5Bn%5D=%28n%28-2+%2B+%282n-4%29%29%29%2F2

S%5Bn%5D=+%28%28-2n+%2B+2n%5E2-4n%29%29%2F2%29

S%5Bn%5D=+%28%28+2n%5E2-6n%29%29%2F2%29

S%5Bn%5D=+%282n%28n-3%29%29%2F2%29

S%5Bn%5D=++n%28n-3%29