Question

What is the recursive formula for this geometric sequence? 2,-10,50,-250,...

Answer 1

The correct answer is D

Explanation:

2 and -5

Answer 2

an = an-1 * (-5)

a1= 2

Explanation:

The recursive formula is

an = an-1 * r

a1= initial term

where a1 is the initial term and r is the common ratio

a1 =2 or the starting term

r = second term / first term = -10/2 = -5

an = an-1 * (-5)

a1= 2