What is the constant ratio "r" in the example 2, –8, 32, –128? Algebra Exponents and Exponential Functions Geometric Sequences and Exponential Functions 1 Answer marfre Mar 11, 2018 #r = -4# Explanation: Given: Geometric sequence #2, -8, 32, -128# #r = -8/2 = 32/-8 = -128/32 = -4# Answer link Related questions What is Geometric Sequences ? How are exponential functions related to geometric sequences? How do you use the geometric sequence formula to find the nth term? What is the constant ratio "r" mean in a geometric sequence formula? Is the following an example of a geometric sequence: –1, 1, –1, 1, –1, ... ? How do you determine the first 5 terms if #a_1=2# and #r=3#? How do you find #a_4# if #a_1=-7# and #r=-3/4#? How do you graph: #y = 2^x + 2#? How do you graph: #f(x)=4^x#? The first term of geometric sequence is 512 and the common ratio is 0.5 what is the 8th term of... See all questions in Geometric Sequences and Exponential Functions Impact of this question 7912 views around the world You can reuse this answer Creative Commons License