Answer: 4-9n^3
Okay so when a letter is by itself it automatically means that the letter has a 1 in front of it
So you’d remove the 1 exponent then evaluate the power of the 6 which then turns that into 36/4 then you’d cancel out the common factor which in this case is 4 which would make the problem
4-nx9n^2
Then you’d calculate the product nx9n^2
Which would leave you with 4-9n^3 and that’s your answer