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

##### 1 Answer

Jan 21, 2016

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 #