Write the expression for the nth term for m9, - 27, 81

I don't think that that "m" belongs in this sequence. Focus on 9, - 27, 81, ...

Multiplying 9 by what number produces the product - 27?

Mult. - 27 by what number produces 81?

This number is called the "common ratio" of this "geometric sequence."

Finish this recursive formula:

a_ (n+1) = (a_n) * ()