Question

if the 7th term is in a geomteric sequence is 64 and the common ration is -2 what are the 1st term and the 14th term
helpppp

Answer 1

general term of a g s is a.r^(n-1)
so
a(-2)6 = 64 so a =?

Answer 2

-12?

Answer 3

sry wat i meant was (-2)^6

Answer 4

so this would be the steps (-2)^6=64 and what would a =?

Answer 5

thats the part that i dont get

Answer 6

wat do u think?

Answer 7

multiply -2 * 6 get the answere and then subtract it by 64?

Answer 8

this a geometric prog.......so u dont subtract.........u just multiply nd divide stuff

Answer 9

-5.333??? it cant be a decimal

Answer 10

-.- ax64 = 64 so a=?

Answer 11

768?

Answer 12

how did u get that?
a = 64/64 so a=?

Answer 13

i multiplied 12 and 64

Answer 14

the answere 1?

Answer 15

yea

Answer 16

so for the 14 th term
1*(-2)^(14-1) = ?

Answer 17

can u show the steps? please

Answer 18

jus use that formula nth term in a gp is a*r*r*r*r....... (n-1) times

Answer 19

-8192?

Answer 20

is it that?

Answer 21

how did u get -8192?

Answer 22

it's (-2)^13

Answer 23

yea u r right

Answer 24

thank u so much ! and thank u for your time!