# Write an equation in standard form of the parabola ppt

A parabola is the set of all points P x, y in a plane that are an equal distance from both a fixed point, the focus, and a fixed line, the directrix.

Solve for y.

## Parabola powerpoint

Parabolas may also have horizontal axes of symmetry and may open to the left or right. The focus is a point on the line of symmetry and the directrix is a line below the vertex. Waves emitted from the focus will be reflected out parallel to the axis of symmetry of a parabola. Therefore, the feedhorn should be 33 inches long. Begin by making a rough sketch of the parabola. Example 2a Write the equation in standard form for the parabola. Step 1 The vertex is 8,4. Step 1 Because the axis of symmetry is vertical and the parabola opens downward, the equation is in the form Check It Out! Check It Out! Multiply each side by 3.

A parabola has a axis of symmetry perpendicular to its directrix and that passes through its vertex. Because a parabola is a conic section, it can also be defined in terms of distance.

## Lesson 8.2 practice a graph and write equations of parabolas

Light or sound waves collected by a parabola will be reflected by the curve through the focus of the parabola, as shown in the figure. Waves emitted from the focus will be reflected out parallel to the axis of symmetry of a parabola. The focus should be 33 inches from the vertex of the cross section. Step 1 Because the directrix is a vertical line, the equation is in the form of. Check Use your graphing calculator. Write the standard form of a parabola with vertex at 3, — 1 and focus at 3, 2. Parabolas may also have horizontal axes of symmetry and may open to the left or right. Step 4 The focus is or 8,3.

STEP 3 Find p. Step 4 The focus is or 8,3. A parabola is the set of all points P x,y in the plane whose distance to the focus equals its distance to the directrix.

What general equations can you use for a parabola when the vertex has been translated? Presentation on theme: "8. Step 1 Because the axis of symmetry is vertical and the parabola opens downward, the equation is in the form Check It Out!

### Lesson 8.2 practice a graph and write equations of parabolas

What general equations can you use for a parabola when the vertex has been translated? Identify the focus, directrix, and axis of symmetry. Example 3b Find the vertex, value of p axis of symmetry, focus, and directrix of the parabola. A parabola is the set of all points P x,y in the plane whose distance to the focus equals its distance to the directrix. Substitute 2, 4 for x1, y1 and x, —4 for x2, y2. The vertex is to the left of the directrix, so the graph will open to the left. So, use only negative y - values. The focus and directrix are equidistance from the vertex. What is the general equation for a parabola?

Therefore, the feedhorn should be 11 inches long. Example 2b Write the equation in standard form for each parabola.

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