# Rational Expressions Calculator

The term “

Rational expression is a fraction whose numerator and denominator is a polynomial function in variables.

We know that division by zero is not allowed since it makes the value of rational expression undefined. So it is always assumed that the denominator of a rational expression is never zero. This condition puts restrictions to the possible values of the variable.

**rational**” in math is not used in the sense of “**sane**” or “**sensible**.” It is instead used to imply a ratio, or fraction.Rational expression is a fraction whose numerator and denominator is a polynomial function in variables.

**Example:**$\frac{x + 2}{x^{2}-3}$ is a rational expression.We know that division by zero is not allowed since it makes the value of rational expression undefined. So it is always assumed that the denominator of a rational expression is never zero. This condition puts restrictions to the possible values of the variable.

**For example,**in a rational expression $\frac{2x + 3 }{x - 4}$, $x$ can never take the value of 4 since $x = 4$ will make the denominator zero and the expression undefined.Adding and Subtracting Rational Expressions | How to Simplify Rational Expressions | Rational Exponents | Rational Functions |

Rationalize a Denominator | What are Rational Numbers |