Question

Find the common ratio of the geometric sequence 18,-90,450,...

Answer 1

try looking it up on socratic

Answer 2

-5

Explanation:

The common ratio is what you have to multiply one term by to get the next term.

so:

`18 * r = -90\\-90 * r = 450`

where r is the common ratio

We can solve these equations:

-90 / 18 = -5

450/-90 = -5

therefore the common ratio is -5