Question

How do you find the 9th term in the geometric sequence 4.5, 9, 18, 36, ...?

Answer 1

1152

Explanation:

Here a (first term) = 4.5 and r (common ratio) `= 9/4.5 = 2`

to find any term in the sequence use : `u_n = ar^(n - 1)`

`rArr u_9 = 4.5 . 2^8 = 1152`