**Exponential Expression**

If *a *is a real number and *n *is a natural number,

** a^{n} **=

*a .*

*a .*

*a ……*

*a***,**

*n *factors of *a*

where *n *is the **exponent, ***a *is the **base, **and *a ^{n} *is an

**exponential expression.**

Exponents are also called **powers.**

** **

For example, the product **2 . 2 . 2 . 2 . 2** is written

**2 **. **2 **. **2 **. **2 **. **2 **= **2 ^{5}**.

5 factors of **2**

The number 5 shows that 2 is used as a factor 5 times. The number 5 is the

**exponent, **and 2 is the **base.**

**2 ^{5} ←**

**Exponent**