Find a_5 and a_n for the geometric sequences. a_4=1080, r=-6

blitzbabeiy

blitzbabeiy

Answered question

2022-01-25

Find a5 and an for the geometric sequences.
a4=1080, r=6

Answer & Explanation

plusmarcacw

plusmarcacw

Beginner2022-01-26Added 10 answers

Given:
a4=1080, r=6
Formula: an=arn1
a4=ar3
1080=a(6)3a=1080216
a=5
To find a5 and an
a5=ar4
=5(6)4
=5(1296)
a5=6480
an=arn1
=5(6)n1
an=5(6)n1

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