Question

What is the 7th term of the geometric sequence where a1 = 625 and a2 = -125?

Answer 1

a2/a1 = r

then use the formula of a geo seq to determine the nth term

an = a1* r^(n-1)

Answer 2

what? :/ that doesnt make sense

Answer 3

it has to make sense; there isnt a simpler way to explain it :/

Answer 4

625 * ... idk what r is. is that like, s?

Answer 5

can you type out the formula with numbers?

Answer 6

you know the value of a2

you know the value of a1

a2/a1 = r .... so you know that value of r with what is given

Answer 7

since your nth term is the 7th term, your n value is 7 in the second case

Answer 8

like "s"? convention tends to use "r" to define the common ratio with

Answer 9

625 * 5^6 ?

Answer 10

that has a slight error, but it works out the same :)

(-5)^6 instead of (5)^6 ... but since the power is even they work out the same in this case :)

Answer 11

so yes

Answer 12

97565625 ?

Answer 13

yep

Answer 14

big numbers are allowed :)