Explanation:
In mathematics, a rational number is any number that can be expressed as the quotient or fraction a/b of two integers, with the denominator b not equal to zero. (Our solved example in mathguru.com uses this concept)
Since b may be equal to 1, every
integer is a rational number. The set of all rational numbers is
usually denoted by a boldface Q.
http://en.wikipedia.org/wiki/Rational_number
Exponentiation
Exponentiation is a mathematical operation, written as a^{n}, involving two numbers, the base a and the exponent (or power) n. When n is a positive integer,
exponentiation corresponds to repeated multiplication; in other words,
a product of n factors of a (the product itself can also be called power)
just as multiplication by a positive
integer corresponds to repeated addition
Identities and
properties
The most important identity satisfied by integer exponentiation is
(Our solved example in mathguru.com uses this concept)
This identity has the consequence
for a ≠ 0, and
Another basic identity is
http://en.wikipedia.org/wiki/Exponentiation
The above explanation is copied from
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