Question

Determine the 15th term of the sequence
-1, -3,-9, -27, ...

Answer 1

-4782969

Explanation:

The first term is -1 and the common ratio is 3. Thus, the sequence is

a(n) = -1*3^(n-1)

and the 15th term is a(15) = -1*3^14 = -4782969