Question

What is the recursive formula for this geometric sequence? -3. -21, -147, -1029, …

Answer 1

`a_(n)` = 7
`a_(n-1)`

Explanation:

A recursive formula allows a rem in the sequence to be found by multiplying the previous term by the common ratio r

For this sequence

r =
`(a_(2) )/(a_(1) )` =
`(-21)/(-3)` = 7 , then recursive formula is

`a_(n)` = 7
`a_(n-1)`