Question

Find the sum of the first 12 terms of the sequence.

1, -4, -9, -14, . . .

Answer 1

alright so, first we have to figure out the sequence, what do you think it is so far?
Hint : 1 + x = -4 , -4 + x = -9 ....

Answer 2

-9+x=-14?

Answer 3

so -5

Answer 4

Yup! so now that we know how to fnd the next numbers in the sequence we can proceed to find all 12 terms, and add them up

Answer 5

What did you get? :)

Answer 6

is it -338?

Answer 7

1+(-4)-9-14-19-24-29-34-39-44-49-54 = = -319 i believe. Let me double check my work :)

Answer 8

I believe it's -319, mind showing me what you did?

Answer 9

1,-4,-9,-14,-19,-24,-29,-34,-39,-44,-59,-64 , my bad i accidently typed in this i didnt do 54

Answer 10

alright, but you understand it right? :)
cuz if u need clarification i can easily help you put with that