Question

Find the sum of the first 8 terms of the sequence. Show all work for full credit.

1, -3, -7, -11, ...

Answer 1

this is an arithmatic sequence with \(a_0=1\) and a common difference of \(d=-3-1=-4\)
sum of first n terms:
\[S_n={n\over2}[2a_0+(n-1)d]\]

Answer 2

haha for full credit, lol we aint getting any full credit.

Answer 3

@some_someone lol I know

Answer 4

@Ambition is that why its "ambition", Ambition?

Answer 5

@electrokid lol yes, But for your equation, do I plug in the numbers?

Answer 6

\[S _{n} = \frac{ n }{ 2 } (a _{1} + a _{n})\]
where:
\[a _{1} \] is the first term.


\[a _{n} \] is the last term.