Question

Identify a1 and r for the geometric sequence
a1 =
r =

Answer 1

a₁ = - 256 , r = -
`(1)/(4)`

Explanation:

The nth term of a geometric sequence is

`a_(n)` = a₁
`(r)^(n-1)`

Given

`a_(n)` = - 256
`(-(1)/(4)) ^(n-1)` , then by comparison

a₁ = - 256 and r = -
`(1)/(4)`