Question

Use the formula below to find the 25th term in the geometric sequence.

an= (-3)2^n-1
A. -100,663,296
B. -50,331,648
C. -25,165,824
D. 50,331,648

Answer 1

B.

Explanation:

To solve, substitute 25 in for x:

`a_(x) = (-3)2^x^-^1`

`a_(x) = (-3)2^2^5^-^1`

`a_(x) = (-3)2^2^4`

`a_(x) = (-3)(16777216)`

`a_(x) = -50331648`