If n is a natural number, then the 2n + 1 power of (- 3) plus the 2n power of 3 (- 3) =?

If n is a natural number, then the 2n + 1 power of (- 3) plus the 2n power of 3 (- 3) =?

2n is even and 2n + 1 is odd
(-3)^(2n+1) + 3(-3)^2n
= -3^(2n+1) + 3*3^2n
= -3^(2n+1) + 3^(2n+1)
=0