-1,-6,-36,-216 find common ratio

Question

1,2,4,8 find common ratio

 

Answer 1

-6/(-1) = 6

 

-36/(-6) = 6

 

The question asks what is the common factor (multiple) to go from one term to the next.  I guess I could just tell you the answer, but you can see what you multiply by from above.  You divide a term of a sequence by the term before it.

 

Answer 2

r = a_n+1 / a_n

 

r = -36 / -6

r = 6