## Thinking Mathematically (6th Edition)

The zero exponent rule is defined as if $a$ is any real number other than 0, then exponent a raised to power $0$ is expressed as ${{a}^{0}}=1$.
For example, consider $a=5$ where $5$ is greater than zero, then ${{5}^{0}}=1$. Hence, the zero exponent rule can be better understood with the help of the example.