Question

Find the third term in a geometric sequence if a = 8 and r = -1. Use the formula a(subscript n) = arⁿ⁻¹

Answer 1

`a_(3) = 8`

Explanation:

=>
`a_(n) = ar^{n-1`

Where n = 3, a = 8 and r = -1

=>
`a_(3) = (8)(-1)^(3-1)`

=>
`a_(3) = (8)(1)`

=>
`a_(3) = 8`