Asked by Aria
find a5 and an for the geometric sequence: a1=8 and r= -5
Answers
Answered by
Bosnian
The n-th term of a geometric sequence with initial value a1 and common ratio r is given by:
an = a1 ∙ r ^ ( n - 1 )
a5 = a1 ∙ r ^ ( 5 - 1 )
a5 = a1 ∙ r ^ 4
a5 = 8 ∙ ( - 5 ) ^ 4
a5 = 8 ∙ 625
a5 = 5000
an = a1 ∙ r ^ ( n - 1 )
a5 = a1 ∙ r ^ ( 5 - 1 )
a5 = a1 ∙ r ^ 4
a5 = 8 ∙ ( - 5 ) ^ 4
a5 = 8 ∙ 625
a5 = 5000
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