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
help plz

Answer 1

D. A recursive formula is one that uses a previous value to solve for others.
If you plug in a_3 in D, then you get the same result. Plus, the common ratio is -4 and since it's a geometric sequence, you have to multiply rather than add.

Answer 2

Thank you so much!! This really helps

Answer 3

You're welcome!