Question

What is the 8th term of the geometric sequence with this explicit formula?

an = -5.(-2)(n-1)
O
A. -1280
B. -640
O
C. 1280
O
D. 640

Answer 1

D

Explanation:

To find the eighth term substitute n = 8 into the explicit formula

`a_(8)` = - 5 ×
`(-2)^(7)` = - 5 × - 128 = 640 → D