Repeated multiplication if the same factor can be written using an exponent.

The

**exponent** indicates how many times the factor, called the

**base**, occurs in the multiplication. The multiplication 2·2·2·2 is in

**factored form.** The exponential expresion 2

^{4} is in

**exponential form.**
3^{1} is read "the first power of three" or just "three" (Usually the exponent 1 is not written)
3^{2} is read "the second power of three" or "three squared"
3^{3} is read "the third power of three" or "three cubed"
3^{4} is read "the fourth power of three"
3^{5} is read "the fifth power of three"
a^{5} is read "the fifth power of a" |

**Any number (except 0) raised to the zero power is equal to 1.**

There is a geometric interpretation of the first three natural-number powers.