Its domain is all real numbers.

Table of Contents Parabolas As we saw in Quadratic Functionsa parabola is the graph of a quadratic function. As part of our study of conics, we'll give it a new definition. A parabola is the set of all points equidistant from a line and a fixed point not on the line. The line is called the directrix, and the point is called the focus.

The point on the parabola halfway between the focus and the directrix is the vertex. The line containing the focus and the vertex is the axis.

A parabola is symmetric with respect to its axis. Below is a drawing of a parabola. In the parabola above, the distance d from the focus to a point on the parabola is the same as the distance d from that point to the directrix.

If a parabola has a vertical axis, the standard form of the equation of the parabola is this: The vertex of this parabola is at h, k. If a parabola has a horizontal axis, the standard form of the equation of the parabola is this: Note that this graph is not a function.

Let l be the tangent line to the parabola at the point P. Let be a line segment whose endpoints are the focus of the parabola and P. Every parabola has the following property: This means in a physical interpretation that a beam sent from the focus to any point on the parabola is reflected in a line parallel to the axis.

Furthermore, if a beam traveling in a line parallel to the axis contacts the parabola, it will reflect to the focus. This is the principle on which satellite dishes are built. The reflective property of a parabola:For #, label the axis of symmetry, vertex, y-intercept, and at least three more points on the graph.

Parabolas in Factored Form If you use a parabola to model a thrown ball, you might want to know exactly where the vertex trace? Can you write an equation for this curve in terms of a and r 2?

Q5 A parabola with two equal roots has its vertex on the x-axis. Such roots are called double roots.

Q6 a. y . How do I write in vertex and standard form a parabola with a vertex (-2,-5) that passes through (6, )? shifts the vertex along the y axis. c: shifts the vertex along the x axis.

Knowing the vertex gives you your first task. let’s start out with basic vertex form equation (mainly because I actually understand vertex form). The form. The general equation of a parabola with vertex is.

In this case we have as the vertex and is a point on the parabola. To find, substitute the two points in.

From this form, we still want to be able to find the vertex (and other things) Standard Form: Property Example: a positive a negative Max or Min? Vertex Axis of Symmetry y-intercept.

The vertex form of a quadratic equation is written like f (x) = a(x - h)2 + k, with the letter h and the letter k being the vertex point of the parabola.

It can be used to create an equation when the vertex of the parabola is known, but other points are not.

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