help!!

The explicit rule for a sequence is an=5(−2)n−1an=5(−2)n−1 .

 

What is the recursive rule for the sequence?

 

• an=−5(an−1),a1=2
• an=−2(an−1),a1=5
• an=−5(an+1),a1=2
• an=−2(an+1),a1=5