anonymous
  • anonymous
What is the common ratio of the geometric sequence: 128, -16,2,-1/4 -8 1/8 8 -1/8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Nnesha
  • 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 :-)
anonymous
  • anonymous
I got-8 is it right?
mathmath333
  • mathmath333
no

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Nnesha
  • Nnesha
how did you get -8 ?
anonymous
  • anonymous
I divided 128 by -16
Nnesha
  • 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
anonymous
  • anonymous
I don't get that
Nnesha
  • Nnesha
|dw:1444250059885:dw| here is an example \[4,8,16\] i would divide 8 by 4 to get ratio not 4 by 8
anonymous
  • anonymous
so the answer is 1/8
Nnesha
  • Nnesha
well 2nd term is -16 and first one is 128 \[\frac{ -16 }{ 128 }= ??\]
anonymous
  • anonymous
0.125
Nnesha
  • Nnesha
keep it in fraction focus on sign negative divide by positive = ?
anonymous
  • anonymous
a negative
Nnesha
  • Nnesha
right so -16/128 = ?
anonymous
  • anonymous
-1/8
Nnesha
  • Nnesha
looks good

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