Question

What is the 8th term of the geometric sequence -1, 4, -16, ...?

Answer 1

darn cant find r orelse this question is a piece of cake D:

Answer 2

wait got it

Answer 3

Can't find what? Normally if I get stuck on a problem I try and use a geometric sequence calculator but I can't seem to get the right answer.

Answer 4

:)))

Answer 5

-1(-4)^8-1 = -65535

Answer 6

I love that you are helping me Dany but that isn't one of my multiple choice answers...

here let me list them for you..

Answer 7

Thank you so much by the way :)

Answer 8

yup thats it :3 use the formula ar^n-1 so if u put -1 in and r as 4 and n as 1 you get -1 then u put 2 u get 4 then u put 3 u get -16

Answer 9

sorry not -4 just 4 okie?

Answer 10

Select one:
A. 16,384
B. -4,096
C. 4,096
D. -16,384

Answer 11

ok let me try that!

Answer 12

wait is it -16384?

Answer 13

D :D

Answer 14

Your guess is as good as mine @Danyboii I'm a writer, not a mathematician. ;)

Answer 15

\[(-1)(4)^{8-1}\]

Answer 16

haha i used the formula lol :p at first i put the wrong value by mistake XD

Answer 17

16,384! :) yay thank you thank you.

Answer 18

@Danyboii I'm sorry, I'm such a bum. Could I ask what formula you used for this geometric sequence? Thank you for your time! :)

Answer 19

ar^n-1 :)

Answer 20

np :3

Answer 21

perfect! :)

Answer 22

a is the first term :3