Question

Write the recursive formula for the geometric sequence.

a1 = -2 a2 = 8 a3 = -32

A. an = -4 an-1

B. an = -2 an-1

C. an = -2 • an-1

D. an = -4 • an-1

Answer 1

a1 = -2
a2 = 8 = -4a1
a3 = -32 = -4a2
an = -4 x an-1