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.
A ray extends indefinitely in one direction, but ends at a single point in the other direction. That point is called the end-point of the ray. Note that a line segment has two end-points, a ray one, and a line none. An angle can be formed when two rays meet at a common point. The rays are the sides of the angle. The point of the end of two rays is called the vertex.