Determine whether the sequence is geometric. If so, find the common ratio. $- 1 , - 2 , - 4 , - 8 , \ldots$
A) 2
B) $- 1$
C) $\frac { 1 } { 2 }$
D) $- 2$
E) not geometric

Question

Quizplus · Accepted Answer

The sequence is geometric with a common ratio of 2, as each term is obtained by multiplying the previous term by -2 (note the negative sign is already accounted for in the sequence, so the ratio is positive 2).

Determine Whether the Sequence Is Geometric −1,−2,−4,−8,…- 1 , - 2 , - 4 , - 8 , \ldots−1,−2,−4,−8,…

Determine Whether the Sequence Is Geometric $- 1 , - 2 , - 4 , - 8 , \ldots$