Question

Enter a recursive rule for the geometric sequence 4, -16, 64, -256

a1=_____ ; an=____

Answer 1

Answer: a1= 4; an= -4an-1

Explanation:

Answer 2

a1 = 4 , an = -
`a_(n-1) *4`

Explanation:

The first term is already given to us and a common ration between the terms is 4 and it is oscillating between positive and negative values so it must be mulitplied by a negative.