The expression of the definition of a function using a parametric equation.

### Example

The function *f* on the set of real numbers defined by the relation *f*(*x*) = A*x*² + B*x* + C is a function defined in parametric form.

This function can also be defined using the relation *f*(*x*) = a(*x* – h)² + k, which is also a parametric form called the standard form of the second-degree function.