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It's normally a bad idea to hang around with negative people or do negative things, but we think it's OK to associate with negative exponents.
Common Core Standards: 8.EE.A.1
Intuition on why a^-b = 1/(a^b) (and why a^0 =1)
Fractional and integer bases raised to positive and negative integer exponents.
Any non-zero number to the zero power equals one. Zero to any positive exponent equals zero. So, what happens when you have zero to the zero power?