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 is correct choice

Answer 2

the general term in a geometric sequence is

\[a_{n} = a_{1} \times r^{n -1}\]

perhaps this will help

Answer 3

so its B

Answer 4

correct