Question

Help please!

Answer 1

WELCOME TO OPEN STUDY!! :D

Answer 2

thanks! :)

Answer 3

anyway, can you help me out?
[SERIES] given a2 = 4, S3 = 17; find common ration and a1

Answer 4

Yes that's why I am here! :D
This is a geometric progression I suppose right?

Answer 5

yeah :)

Answer 6

A1 + a2 + a3 = 17 right?
a2 = 4
a1 + a3 = 13
a + ar^2 = 13
Getting this?

Answer 7

yeah..

Answer 8

Solve the Quadratic equation you get after that!
ar = a2 = 4
so
a = 4/r
Get a quadratic equation and then solve

Answer 9

hmm... i think i already did this kind of solution a couple of hours ago, and my and answer didn't seem to be right as i've
checked on the calculator XD

Answer 10

so did you get r = 13 +/- sqrt(105) all over 8? :D

Answer 11

I hate agreeing to it but YES I DID@!! :D

Answer 12

OM... XD

Answer 13

:') :D

Answer 14

i've done trial and error, and this is what i've got r= 1/4 and a1 = 12. pretty convincing cuz it actually worked XD. too bad i need the solution to merit a point... well, thanks! :)

Answer 15

:)