Question

Find the sum of the first 12 terms of the sequence. Show all work for full credit.

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

Answer 1

do you see the pattern?

Answer 2

+ -5?

Answer 3

or just -5. keep doing that to the numbers until you have the first 12, then add them all up.

Answer 4

12th = -59
Sum of all = -378

Answer 5

isnt the 12th -54?

Answer 6

Yes, I forgot all about the 1. So the sum is =270

Answer 7

Negative = -270

Answer 8

I got a different number.

Answer 9

-318?

Answer 10

yes

Answer 11

sorry! i was helping a different person. yes, -318 is the answer

Answer 12

good luck :)

Answer 13

That was much simpler than I thought. Thank You, both !

Answer 14

no problem