Question

sigma sigma sigma... I finished adding up the whole equation and i was wondering what is the correct way to write it all down?

Answer 1

@Nnesha

Answer 2

sigma and osama
ma XD

Answer 3

for 1 i got -12, for 2 i got 26 for 3 i got -42 and for 4 i got 60

Answer 4

hmm for 2 how did you get 26 ?

Answer 5

oh wow, just realized i did this wrong... i was multiplying by the whole number instead of doing the power thing... so like, instead of doing (-1)^2 i was doing (-1)(2)

Answer 6

for 2 i should get 13, not 26

Answer 7

for 3 i should get -14 and for 4 i should get 15

Answer 8

right! \[\huge\rm (-1)^\color{reD}{2}(\color{red}{2}+11)=13\]

Answer 9

what is the correct form of writing this whole thing as an answer instead of having a bunch of equations everywhere?

Answer 10

so -12,13,-14,15

Answer 11

tha's all?

Answer 12

hmm to find sum we can use formula
or just add all terms
-12+13-14+15
i have to go i'm getting late but i'll look at it later
i can't think right now

Answer 13

we don't need any equation for this just show ur work
like (-1)^1 (1+11)= -12 and all other 3 terms
and then add
that's it

Answer 14

here is a link if you need more information http://home.windstream.net/okrebs/page136.html

Answer 15

thanks!