parker1751 parker1751
  • 16-05-2016
  • Mathematics
contestada

Find the sum of the first 8 terms of the geometric series with a1=4 and r=3

Respuesta :

bello1998 bello1998
  • 16-05-2016
An=a1(r)^n-1
a1=4(3)^2-1
a2=4(3)^3-1
keep going till 
a8=4(3)^9-1
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