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

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Answer 1 · 2016-09-23T12:38:36

$n^(th)$ term $a_n$ is $4xx3^(n-1$

If $a_1$ is the first term of a geometric sequence and $r$ is the common ratio, then the $n^(th)$ term $a_n$ is given by

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

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