25.0k views
5 votes
Which formula can be used to find the ninth term of a geometric sequence where the first term is 8 and the common ratio is -3

User Maydin
by
8.6k points

1 Answer

3 votes
For a geometric sequence with a first term of "a" and a common ratio of "r", the n-th term is
.. an = a*r^(n-1)

For this problem, you have a = 8, r = -3, and n = 9. Filling these values into the formula gives
.. a9 = 8*(-3)^(9-1)
.. a9 = 8*(-3)^8

_____
a9 = 52,488
User Jack Nock
by
8.0k points

No related questions found