Chapter 7 - Exponents and Exponential Functions - 7-8 Geometric Sequences - Practice and Problem-Solving Exercises - Page 470: 14

-2

You have the sequence:6,-12,24,-48. Find the common ratio by using the formula: R=$\frac{a2}{a1}$,R=$\frac{a4}{a3}$.Plug in the values to get the ratios. r=$\frac{-12}{6}$=-2 r=$\frac{-48}{24}$=-2 There is a common ratio, r=-2. So the sequence is geometric.