# What is the directrix of the parabola calculator?

## What is the directrix of the parabola calculator?

Every parabola has a point inside the curve called the focus and a line outside the curve called the directrix. Each point on the parabola is equidistant from the focus and directrix….How to Find a Parabola’s Equation from Its Directrix and Focus.

Parabola Calculator (y = ax² + bx + c)
Directrix: y =
Focus: ( , )

What is the equation of a parabola calculator?

The parabola equation in its vertex form is y = a(x – h)² + k , where:

1. a — Same as the a coefficient in the standard form;
2. h — x-coordinate of the parabola vertex; and.
3. k — y-coordinate of the parabola vertex.

What are the roots of a parabola?

The roots are the x-intercepts, where the parabola crosses the x-axis. If the parabola opens up and it’s vertex is below the x-axis then it crosses the x-axis in two places and has two (real) roots. If the vertex is on the x-axis then the parabola has one root.

### What is equation of Directrix?

The equation of the directrix of the parabola y2=4ax is given by x = -a.

Where is the Directrix of a parabola?

The directrix is perpendicular to the axis of symmetry of a parabola and does not touch the parabola. If the axis of symmetry of a parabola is vertical, the directrix is a horizontal line . If we consider only parabolas that open upwards or downwards, then the directrix is a horizontal line of the form y=c .

How do you find the Directrix?

We use the equation y=k−p y = k − p to find the directrix. Therefore, The focus of the is parabola (4,−3) and the directrix is y=1 .

#### How do you find the equation of a focus and Directrix?

Let (x0,y0) be any point on the parabola. Find the distance between (x0,y0) and the focus. Then find the distance between (x0,y0) and directrix. Equate these two distance equations and the simplified equation in x0 and y0 is equation of the parabola.

Which is the equation for the Directrix related to the parabola?

The equation for the directrix related to the parabola is x = 2.

How do you find the roots?

We can determine the nature of the roots by using the discriminant. The discriminant of the quadratic equation ax2 + bx + c = 0 is D = b2 – 4ac. The quadratic formula is x = (-b ± √ (b² – 4ac) )/2a. So this can be written as x = (-b ± √ D )/2a.

## How do you find the Directrix in math?

The directrix of a parabola can be found, by knowing the axis of the parabola, and the vertex of the parabola. For an equation of the parabola in standard form y2 = 4ax, with focus at (a, 0), axis as the x-axis, the equation of the directrix of this parabola is x + a = 0 .

What is the equation of the directrix of the parabola quizlet?

The equation for the directrix of the parabola is x = -4. In which direction does the parabola open? The focus of a parabola is located at (0, -2). The directrix of the parabola is represented by y = 2.

How do you solve for Directrix?

### How to find equation of parabola given focus and directrix?

Determine the horizontal or vertical axis of symmetry.

• Write the standard equation.
• Compare the given equation with the standard equation and find the value of a.
• Find the focus,vertex and directrix using the equations given in the following table.
• How to find vertex focus and directrix of a parabola?

The directrix of a parabola helps to write the equation of a parabola.

• The directrix of a parabola helps to locate the axis of the parabola.
• The directrix of the parabola is useful to find the equations of the focal chords.
• The directrix of the parabola is useful to find the equation of the latus rectum and the endpoints of the latus rectum.
• How to calculate a parabola?

Convert Input (s) to Base Unit

• Evaluate Formula
• Convert Result to Output’s Unit
• #### How to find the equation of a parabola calculator?

y = a (x – h)2 + k And if the parabola opens horizontally (which can mean the open side of the U faces right or left), you’ll use this equation: x = a (y – k)2 + h Because the example parabola opens vertically, let’s use the first equation. Next, substitute the parabola’s vertex coordinates (h, k) into the formula you chose in Step 1.