# How do you find the indicated term for the geometric sequence a_1=7, r=2, n=4?

Aug 13, 2017

Use the formula:

${a}_{n} = {a}_{1} {r}^{n - 1}$

#### Explanation:

Substitute 7 for ${a}_{1}$, 2 for r, and 4 for n:

${a}_{4} = 7 {\left(2\right)}^{4 - 1}$

${a}_{4} = 56$