In fact, talking with the patient may be the most important diagnostic tool the doctor has. The recommendation is that doctors routinely screen all individuals for depression. This screening might occur during a visit for a chronic illness, at an annual wellness visit, or during a pregnancy or postpartum visit.
1 is called the standard form, 2  is called the factored form, where x1 and x2 are the roots of the quadratic function and the solutions of the corresponding quadratic equation. 3  is called the vertex form, where h and k are the x and y coordinates of the vertex, respectively.
Two-dimensional objects have vertices where their lines meet, and three-dimensional objects have vertices where their planes meet. In this sense, vertices can sometimes be described as the corners of a geometric structure. In mathematics, the term vertex can also refer to the peak of a parabola.