aaliyahplummer1 aaliyahplummer1
  • 08-08-2017
  • Mathematics
contestada

What is the 8th for the geometric sequence 6,561;−2,187;729;−243;…

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mreijepatmat
mreijepatmat mreijepatmat
  • 09-08-2017
1st let's calculate r the common ratio:
 r = (-2187)/(6561) = (729)/(-2187) = -1/3

Value of nth term = a₁.rⁿ⁻¹, where a₁= 1st term and n, the rank

Value of nth term = 6561r⁸⁽⁻¹⁾ = 6561.(-1/3)7

Value of nth term = -3
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