Question

Which of the following recursive formulas represents the same geometric sequence as the formula an = 2 • 2n - 1?

A. an = 2 • an - 1
B. an = 4 • an - 1
C. an = 4 + an - 1
D. an = 2 + an - 1

Answer 1

it's b

Answer 2

wait,what is a?

Answer 3

@sparrow2 what do u mean?

Answer 4

is it a*n=2*2*n-1?

Answer 5

The n is below the a, idk what its called

Answer 6

@sparrow2

Answer 7

index

Answer 8

are you sure that in B there is an not only n?

Answer 9

hey lil
the geometric you are given is it like this \(a_n=2~2^{n-1}\)

Answer 10

Yes @xapproachesinfinity exactly like that

Answer 11

ok good

Answer 12

to know which recursive formula work we need to try some values and compare

Answer 13

or try to come up with the recursive formula for the given implicit formula

Answer 14

let's try the latter one.
we have \[a_n=2~~2^{n-1}\]
so \(a_{n+1}=2~2^{n}\)

Answer 15

hey where did you go