# What are Rational Functions?

Rational functions are functions, which are created by dividing two function. Formally, they are represented as $\frac{f \left(x\right)}{g \left(x\right)}$, where $f \left(x\right)$ and $g \left(x\right)$ are both functions.
For example: $\frac{2 {x}^{2} + 3 x - 5}{5 x - 7}$ is a rational function where $f \left(x\right) = 2 {x}^{2} + 3 x - 5$ and $g \left(x\right) = 5 x - 7$.