If a and B are opposite numbers, n is a positive integer. Are the 2n power of a and the 2n power of B opposite numbers

If a and B are opposite numbers, n is a positive integer. Are the 2n power of a and the 2n power of B opposite numbers

A and B are opposite numbers
b=-a
b^(2n)=(-a)^(2n)
=[(-a)^2]^n
=(a^2)^n
=a^(2n)
So it's not opposite, it's equal