## Algebra 1: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 7 - Exponents and Exponential Functions - 7-8 Geometric Sequences - Practice and Problem-Solving Exercises - Page 470: 29

#### Answer

The recursive formula is $a_{1}$=1 and $a_{n}$=$a_{n-1}$ $\times$ 5.

#### Work Step by Step

Use the recursive formula $a_{1}$=1, $a_{n}$=$a_{n-1}$$\times$r. The starting value is 1 so it is the $a_{1}$ You have the sequence 1,5,25 so use the common ratio formula(r=$\frac{{a_{2}}}{{a_{1}}}$) r=$\frac{5}{1}$=5 and r=$\frac{25}{5}$=5.So the common ratio is 5.Substitute the value of a1 and R into the recursive formula: The recursive formula is $a_{1}$=1 and $a_{n}$=$a_{n-1}$ $\times$ 5.

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