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

ok, this time i'll give you the formula, and you have to work it out.

\[a_n = a_1 \times r^{n-1}\]

Answer 2

find r by using the fact

\[r \times a_n = a_{n+1}\]