Question

Find the first, fourth, and eighth terms of the sequence. a(n)=-2 x 2^n-1

Answer 1

2, 16 and 256.

Explanation:

Just substitute for n:-

first term ( when n = 1) = 2 * 2^(1-1)

= 2 * 1 = 2

4th term = 2 * 2^(4-1) = 16

8th term = 2* 2^(8-1) = 256