# Identify the Sequence -5 , -10 , -20 , -40

, , ,
This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by gives the next term. In other words, .
Geometric Sequence:
This is the form of a geometric sequence.
Substitute in the values of and .
Remove parentheses.
Identify the Sequence -5 , -10 , -20 , -40