Question

is the sequence geometric? if so, identify the common.
2, 6, 18, 54,...

Answer 1

You can tell if it is geometric by dividing each term by the previous term.

Answer 2

For example: 6/2=3
18/6=3
54/18=3

Answer 3

So yes...it is geometric because we always get the same thing. And the number we get, the 3, is called the common ratio.

Answer 4

@Mertsj so, the identity common is?

Answer 5

The common ratio which is 3, r = 3

Answer 6

Do you mean:
\[a _{n}=ra _{n-1}\]

Answer 7

you are perfect