Question

Medal! find the common ratio of the sequence
-175, -86, -43, -21.5 ...
86
2
-86
1/2

Answer 1

if you have \[ar,ar^2,ar^3,ar^4,...\]
then r is the common ratio

you can find the common ratio if you have a geometric sequence by doing second term/first term
and then reduce that fraction

Answer 2

Common ratio is the ratio between the terms of geometric sequence.

Common ratio 'r' = 2nd term/1st term = 3rd term / 2nd term = 4th term/3rd term and so on

so can you guess what could be the common ratio here ?

Answer 3

i got 2.... is that right?

Answer 4

what is the second term?
what is the first term?

Answer 5

then put second term over the first term and reduce and that is your answer