Question

Write the explicit formula for the geometric sequence.

a1 = -5 a2 = 20 a3 = -80

A. an = -5 • (-4)n

B. an = -5(-4)n-1

C. an = -4(-5)n-1

D. an = -5 • (4)n

Answer 1

\[a_n = -5 \times (-4)^{n-1}\]

Answer 2

So, option B is correct

Answer 3

thanx