Quadratic Function In Standard Form
In mathematics , an argument of a function is a specific input in the function, also known as an independent variable . When it is clear from the context which argument is meant, the argument is often denoted by the abbreviation arg . 
The graph of a quadratic function is a parabola. The axis of symmetry of a parabola is a vertical line that divides the parabola into two congruent halves. The axis of symmetry always passes through the vertex of the parabola . The x -coordinate of the vertex is the equation of the axis of symmetry of the parabola.