anonymous
  • anonymous
Write the explicit formula for the geometric sequence a1 = -5 a2 = 20 a3 = -80 I already picked "A" so i'm not including it I think the right answer is D but i am not certain. B. an = -5(-4)n-1 C. an = -4(-5)n-1 D. an = -5 • (4)n
Mathematics
jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
the formula for the nth term an = a1r^(n-1) where a1 = first term and r = common ratio common ratio ra = second term / first term = 20/-5 = ? D is not correct
anonymous
  • anonymous
4?
anonymous
  • anonymous

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welshfella
  • welshfella
common ratio r = 20/-5 = -4 ( + / - = -)
anonymous
  • anonymous
So it would be B.
welshfella
  • welshfella
yes
anonymous
  • anonymous
Alright thanks
welshfella
  • welshfella
yw

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