What constitutes a rational expression? How would you explain this concept to someone unfamiliar with it?

A rational expression is an equation where the value of P is divided by the value of Q. The values of P and Q are actually associated with polynomials in a rational expression. In order to explain what constitutes a rational expression to someone I would explain that Q in this case cannot be equal to zero. In the following situation (x-4)/(x^2-8x+16) you have to make sure that the solution (4) is not used because it will make the denominator 0 which means that the equation will be undefined.

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