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

geometric have nothing to do with addition or subtraction

Answer 2

the general formula for a geometric seq is:\[a_n=r*a_{n-1}\]

Answer 3

so to figure out r; just find the value which get the same outcome

an = r * an-1

8 = r * -2