Question

What is recursive rule for the sequence?

Answer 1

$a_{n}=9(-5)^{n-1} \\ \\ a_{1}=9*5^{1-1}=9 \\ \\ a_{1}=9 \\ \\r=-5 \\ a_{n}=-5a_{n-1} This is geometric sequence, correct answer is A.$

Answer 2

It should be the first one an = -5 (an -1), a1 =9