anonymous
  • anonymous
Find an explicit rule for the nth term of a geometric sequence where the second and fifth terms are -36 and 2304, respectively.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
do you have a general idea?
anonymous
  • anonymous
i tried using this http://openstudy.com/study#/updates/513cdcd0e4b029b0182b5689 and i did -36 - ar 2304 = ar^4 2304 = ar * r^3 2304 = -36 * r^3 2304 = r^3????????
anonymous
  • anonymous
with r being the common ratio but i didn't get an integer

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More answers

zepdrix
  • zepdrix
your second to last step looks correct 2304 = -36 * r^3 what happened to the -36 in the next step? did you mean to divide the 2304 by that amount?
anonymous
  • anonymous
r^3=2304/-36=?
anonymous
  • anonymous
-64
anonymous
  • anonymous
\[r^3=\left( ? \right)^3\] r=?
anonymous
  • anonymous
cube root it = 4?
anonymous
  • anonymous
no
anonymous
  • anonymous
4^3=64
anonymous
  • anonymous
\[r^3=-64=\left( -4 \right)^3,r=-4\]
anonymous
  • anonymous
does that mean it would be an = 9 * (-4)^n - 1?
anonymous
  • anonymous
correct.
anonymous
  • anonymous
YAY thanks :)))
anonymous
  • anonymous
yw

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