Question

Find the common ratio of the following geometric sequence:

−10, 40, −160, 640

Answer 1

The common ratio of a geometric sequence is found by dividing any term in the sequence by the previous term.

So, for this sequence,

40/(-10) = -4

(-160)/40 = -4

640/(-160) = -4

Thus, the common ratio of this geometric sequence is -4.