To learn how to format things like powers, try
here.
To learn how to simplify expressions with exponents, try
here.
Since you haven't shown your steps, there is no way to determine where you might have gone wrong. But you might want to consider using the definition of exponents to help keep track of what's going on.
. . . . .Cancel off the common factors. How many 3's do you have left over? Where are they? What is the value of the simplified result?