Madisonsheadavis Madisonsheadavis
  • 18-05-2017
  • Mathematics
contestada

R=-2 s7=86 and a1=2 find a7 for the geometric series

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taskmasters
taskmasters taskmasters
  • 01-06-2017
A geometric series is one where each term is obtained by multiplying a non-zero number, known as the common ratio, r. 
Using the formula for the nth term of a geometric series which is an=a1r^(n-1), we find that a7=-128. This is done by substituting values of a1=2, r=-2, and n=7.
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