## Algebra: A Combined Approach (4th Edition)

Repeated multiplication of the same factor can be written using an exponent. We know that an exponential expression can be written as $a^{n}$ (where $a$ is the base and $n$ is the exponent). In other words, $a^{n}$ is equivalent to multiplying $a$ by itself $n$ times. For example, $3^{4}=3\times3\times3\times3$.