# What is the constant ratio "r" in the example 2, –8, 32, –128?

##### 1 Answer
Mar 11, 2018

$r = - 4$

#### Explanation:

Given: Geometric sequence $2 , - 8 , 32 , - 128$

$r = - \frac{8}{2} = \frac{32}{-} 8 = - \frac{128}{32} = - 4$