What is a formula for the nth term of a given sequence
-12,-16,-
an = -12(-4)^n
a^n = -12 - 4 (n+1)
an = -8 - 4n
an = -12(-4)^n-1

Step-by-step explanation:

The given sequence is

-12,-16,-20...

The first term of this sequence is .

The common difference is

The nth term of this arithmetic sequence is;

We substitute the values for the first term and the common difference to obtain;