Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7, ...

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Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7, ...

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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@Nnesha Would it be an = 7 • (-1)n - 1?
Or an = 7 • (-1)n
depends what you start with n=0 or n=1?

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Other answers:

How can I tell? @xapproachesinfinity
if you decided to start with n=1 as your first term then a_n= 7.(-1)^{n-1}
your first one is correct 7 * (-1)^(n-1)
Oh ok thanks so much! Could you help me with another one?
there is no consequence in choosing an=7(-1)^n as a correct answer as well
it really depends on what i said
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?
this is a geometric series with common ratio = -1
both are good as i see it
just point that n>0 if you choose the first
otherwise choose the second
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?
post that on different post
Ok
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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