Question

Geometric sequence question!

Answer 1

so in geometric sequence, first thing we find is the common ration,
could you get it ? know what it is ?

Answer 2

its -2

Answer 3

thats is correct
now just use thee formula
\(\Large a_n = a_1 r^{n-1}, \quad n\ge 1\)

a1 = 1st term = 3
r =-2

Answer 4

so which option ?

Answer 5

so its 3(-2)^n-1 where n is greater than or equal to 1

Answer 6

and sorry I was afk

Answer 7

that is correct :)

Answer 8

yay thank you!