# Missing terms of a geometric seqeunce

1. Jun 5, 2012

### EricPowell

1. The problem statement, all variables and given/known data
Write the first 5 terms of the geometric sequence
3, __ , 32x+1, __, __

2. Relevant equations
tn=arn-1

3. The attempt at a solution
tn=arn-1
32x+1=3r3-1
r2=32x+1 / 3
r=√32x+1 / √3

I'm stuck

2. Jun 6, 2012

### Villyer

Before taking the square root, try to simplyfy the right side. What is $\frac{3^{2x+1}}{3^{1}}$?

3. Jun 6, 2012

If $a,b,c$ are three consecutive terms of a geometric sequence, $b^2 = ac$.