anonymous
  • anonymous
Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7, ...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Nnesha Would it be an = 7 • (-1)n - 1?
anonymous
  • anonymous
Or an = 7 • (-1)n
xapproachesinfinity
  • xapproachesinfinity
depends what you start with n=0 or n=1?

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anonymous
  • anonymous
How can I tell? @xapproachesinfinity
xapproachesinfinity
  • xapproachesinfinity
if you decided to start with n=1 as your first term then a_n= 7.(-1)^{n-1}
welshfella
  • welshfella
your first one is correct 7 * (-1)^(n-1)
anonymous
  • anonymous
Oh ok thanks so much! Could you help me with another one?
xapproachesinfinity
  • xapproachesinfinity
there is no consequence in choosing an=7(-1)^n as a correct answer as well
xapproachesinfinity
  • xapproachesinfinity
it really depends on what i said
anonymous
  • anonymous
For Find the vertices and foci of the hyperbola with equation quantity x minus 5 squared divided by 144 minus the quantity of y minus 4 squared divided by 81 = 1. Would the answer be -5?
welshfella
  • welshfella
this is a geometric series with common ratio = -1
xapproachesinfinity
  • xapproachesinfinity
both are good as i see it
xapproachesinfinity
  • xapproachesinfinity
just point that n>0 if you choose the first
xapproachesinfinity
  • xapproachesinfinity
otherwise choose the second
anonymous
  • anonymous
Ok thanks For Find the vertices and foci of the hyperbola with equation quantity x minus 5 squared divided by 144 minus the quantity of y minus 4 squared divided by 81 = 1. Would the answer be -5?
xapproachesinfinity
  • xapproachesinfinity
post that on different post
anonymous
  • anonymous
Ok
welshfella
  • welshfella
I see your point "xapproachesinfinity but in the case of a geometric series it always seems to start with n = 1.

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