# How do you write an nth term rule for r=3 and a_1=4?

##### 1 Answer
Sep 23, 2016

${n}^{t h}$ term ${a}_{n}$ is 4xx3^(n-1

#### Explanation:

If ${a}_{1}$ is the first term of a geometric sequence and $r$ is the common ratio, then the ${n}^{t h}$ term ${a}_{n}$ is given by

a_n=a_1xxr^(n-1)=4xx3^(n-1