Question 1025555: Find the sum of the first 8 terms of the sequence.
1, -3, -7, -11, ...
Found 2 solutions by Emilym1234, MathTherapy:
Answer by Emilym1234(10)   (Show Source):
You can put this solution on YOUR website! You need to take
the first 8 terms,
and the sum means
to add. Thus, you
should take the first
8 terms, which should
be given, then just add together!
For example, if my
terms are 1,1,1,1,1,1,1,1, my
answer would be 8.
Hope this helped :)
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
Find the sum of the first 8 terms of the sequence.
1, -3, -7, -11, ...
This is an AP with d (common difference) = - 4, and the 1st term, or  .
Use the formula for the sum of an AP:  to get the sum of the 1st 8 terms. By the way, n = 8
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