Question

What is the 7th term of the geometric sequence where a1 = -2 and a5 = -512?

Answer 1

find the common ratio using the formula \[\Large A_n = A_1 r^{n-1}\]
let \(\large A_n = A_5\)
\[\Large A_5 = A_1r^{5-1}\] i've done enought..you do the rest :D

Answer 2

ok thanks

Answer 3

you know what to do after you get the r right?

Answer 4

ill try

Answer 5

okay :0

Answer 6

:)

Answer 7

yeah that was supposed to be a :) too lol

Answer 8

u know how hoblos to do this? What is the 7th term of the geometric sequence where a1 = -2 and a5 = -512?

Answer 9

a5 = a1*r^4

r^4 = a5/a1 = 512/2 = 256

so r = fourth-root(256) = 4

a7 = a1*r^6 = (-2)*(4)^6 = -2(4096) = -8192