When an exponent is equal to 0, the whole expression equals one. It does not matter what the base is - the expression will always equal 1. When the exponent is negative, the expression equals 1 over the expression. Here are some examples where this might be useful:
[tex]x^{0} = 1[/tex]
[tex]x^{-4} = \frac{1}{x^4}[/tex]
Hope you found this helpful!
