SOLUTION: Write an explicit formula for the sequence an=-3an-1 and a1=3 explain your answer

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Question 1008519: Write an explicit formula for the sequence an=-3an-1 and a1=3 explain your answer
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Since they give you a1 = 3 and that the common ratio is -3, you can write the explicit formula as:
an = a1*r^(n-1)
and in this case
an = 3*(-3)^(n-1)