For any rational number a and a positive integer n,
an = axaxaxa….xa ( n times)
an is called the nth th power of a and is also read as a raised to the power n. The rational number ‘a’ is called the base and N is called the exponent or power or index.
Eg. In 65. , 6 is called the base and 5 is called power.
A negative rational number raised to an even power is positive.
A negative rational number raised to an odd power is negative.