**The Zero Index:**

Any variable or product of variables raised to the power of 0 is equal to 1.

**a ^{0 }= 1** (a ≠ 0)

(0º is undefined)

**Negative Indices:**

A variable raised to a negative power is equal to 1 divided by the same variable raised to the positive power.

**a‾ ^{m} = 1/a^{m }** (a ≠ 0)

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