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

since its geometric, do you add or multiply to get to the next term?

Answer 2

multiply

Answer 3

then its an choice between C and D

Answer 4

what number do we have to multiply -2 by to get 8?

-2n = 8

Answer 5

i spose n is a bad choice of variable in this ...

-2r = 8 might be more visually correct