Question

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

Answer 1

Answer: 640 (B)

Explanation:

The explicit formula

an = -5 × ( -2 )(n - 1) bearing in mind that n = 8

Therefore, putting n = 8 - 1, = 7

-5 × -2(7) raised to the power of 7

an = -5 × -128

= 640