SOLUTION: Write a formula for the arithmetic sequence by using the general formula and then simplify. a1= -8 and d= 11

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Question 864090: Write a formula for the arithmetic sequence by using the general formula and then simplify.
a1= -8 and d= 11

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad
a%5Bn%5D=+8+%2B%28n-1%29%2A11+=+11n-3
Arithmetic Sequence:
a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad
S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2}
S%5Bn%5D=+%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29