Function defined as follows : \(f : \mathbb{R}\) →\(\mathbb{R}_{+}\) :

*x*↦ |*x*|.### Symbol

The absolute value of a real number *x* is written as |*x*| and is read as “the absolute value of *x *“.

- The standard form of the relation that describes this function is
*f*(*x*) = a |*x*– h| + k, in which the coordinates of the vertex are (h, k). - The general form of the relation that describes this function is
*f*(*x*) = a |b*x*+ c| + d where a, b, c and d are real numbers.