Question

Find the nth term of the geometric sequence with first term -2 and common ratio 1/3.

Answer 1

nth term = a r^(n-1)

where a=first term and r = common ratio

Answer 2

ok let me try

Answer 3

what is a? @cwrw238

Answer 4

first term = -2

Answer 5

so a1?

Answer 6

I have -2 * 1/3^(n-1)

Answer 7

but what is n?

Answer 8

yes first term is sometimes referred to as first term

Answer 9

as a1!

Answer 10

what is n in my equation above

Answer 11

you asked for the nth term - n is any term

Answer 12

So what do I plug in there??

Answer 13

I have -2 * 1/3^(n-1)
this is what i have, how to solve?

Answer 14

your answer is correct

-2*(1/3)^(n-1)

Answer 15

thats it - thats the formula for the nth term

Answer 16

are u sure that is all I put?

Answer 17

for example if you need the sec ond term it is

-2*(1/3)^(2-1) replacing n by 2

Answer 18

= -2 * 1/3 = -2/3

Answer 19

yes - i'm sure

Answer 20

so my final answer is -2*(1/3)^(n-1)
?

Answer 21

right