Question

What is the 8th term of the geometric sequence -1, 4, -16, …?
i really need help!!

Answer 1

what is the first term

Answer 2

-1 i assume

Answer 3

yep

Answer 4

what is the common ratio

Answer 5

i have no idea

Answer 6

pick any term and divide it by the previous term

Answer 7

so -4?

Answer 8

good

Answer 9

how would you use those two facts to get the nth term?

Answer 10

no clue

Answer 11

what is the general formula for a geometric sequence

Answer 12

i have no clue

Answer 13

the formula is

\[\large a_{n} = a*r^{n-1}\]

Answer 14

in this case

first term: a = -1
common ratio: r = -4

Answer 15

so plug those two pieces of info in

Answer 16

and tell me what you get