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

If you're still there... think about it :)
What did you multiply to -2 so that you get 8?
What did you multiply to 8 so that you get -32?

Answer 2

-4?

Answer 3

That's right :)
Every term is the previous term multiplied by -4.
Does that answer the question?

Answer 4

thank you so much. i gave you a medal.

Answer 5

No problem :)
You got it yourself, you just needed a little nudge ;)