## anonymous one year ago What is the common ratio of the geometric sequence: 128, -16,2,-1/4 -8 1/8 8 -1/8

1. Nnesha

: geometric sequence ,to find common ratio $\large\rm \color{red}{r =\frac{ a_2 }{ a_1} ~~or~~ \frac{ a_4 }{ a_3 }}$ divide any term by previous one :-)

2. anonymous

I got-8 is it right?

3. mathmath333

no

4. Nnesha

how did you get -8 ?

5. anonymous

I divided 128 by -16

6. Nnesha

divide any term with the previous  one a_2 = 2nd term over a_1 = first term divide 2nd term by first one or 3rd term by 2nd one

7. anonymous

I don't get that

8. Nnesha

|dw:1444250059885:dw| here is an example $4,8,16$ i would divide 8 by 4 to get ratio not 4 by 8

9. anonymous

so the answer is 1/8

10. Nnesha

well 2nd term is -16 and first one is 128 $\frac{ -16 }{ 128 }= ??$

11. anonymous

0.125

12. Nnesha

keep it in fraction focus on sign negative divide by positive = ?

13. anonymous

a negative

14. Nnesha

right so -16/128 = ?

15. anonymous

-1/8

16. Nnesha

looks good