# How to find the x intercept of a quadratic equation

## Parabola Intercepts To find the x-intercepts of a quadratic equation, let y = 0. Write down the new equation ax squared + bx + c = 0 and the quadratic formula that gives the solution .

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In this section, we will learn how to find the root s of a quadratic equation. Roots are also called x -intercepts or zeros. A quadratic function is graphically represented by a parabola with vertex located at the origin, below the x -axis, or above the x -axis. Therefore, a quadratic function may have one, two, or zero roots. When we are asked to solve a quadratic equation, we are really being asked to find the roots. We have already seen that completing the square is a useful method to solve quadratic equations. This method can be used to derive the quadratic formula, which is used to solve quadratic equations.

Quadratic equations form a parabola when graphed. The variables y and x are graphed on the y and x axes, and a, b and c are constants. Depending on how high the parabola is located on the y-axis, an equation may have zero, one or two x-intercepts but it will always have one y-intercept. Find the y-intercept for the equation by letting x equal zero. The quadratic formula can give zero, one or two solutions.

Coordinates of the vertex: the y-value is found by substituting the x-value. Intercepts The intercepts of a parabola are where the curve or graph of the function crosses the axis. Step 1. First, find the y-intercept. Since the y-intercept is the point where the graph crosses the y-axis, the value for x at this point is zero.

Two points determine any line. However, since a parabola is curved, we should find more than two points. In this text, we will determine at least five points as a means to produce an acceptable sketch. To begin, we graph our first parabola by plotting points. Choose some values for x and then determine the corresponding y -values. Then plot the points and sketch the graph. Plot these points and determine the shape of the graph.

Learning Objectives After completing this tutorial, you should be able to: Find the vertex of a quadratic function. Determine if the vertex is the maximum or minimum point of a quadratic function. Graph a quadratic function. Introduction In this tutorial we will be looking at graphs of quadratic functions. The graph of a quadratic function is called a parabola and has a curved shape. One of the main points of a parabola is its vertex.

## Find Vertex and Intercepts of Quadratic Functions - Calculator

The graph of a quadratic function is a parabola., The following graphs are two typical parabolas their x-intercepts are marked by red dots, their y-intercepts are marked by a pink dot, and the vertex of each parabola is marked by a green dot:.

## How do you find the x intercepts of a quadratic function?

Much as we did in the application problems above, we also need to find intercepts of quadratic equations for graphing parabolas. However, there are many quadratics that cannot be factored. We can solve these quadratics by first rewriting them in standard form. Because the quadratic is not easily factorable in this case, we solve for the intercepts by first rewriting the quadratic in standard form. We can check our work by graphing the given function on a graphing utility and observing the roots. Substituting these values into the formula we have:.

As you can see from the picture below, the y-intercept is the point at which the parabola intercepts the y-axis. The x-intercepts are the points or the point at which the parabola intersects the x-axis. A parabola can have either 2,1 or zero real x intercepts. A parabola can have 2 x-intercepts, 1 x-intercept or zero real x intercepts. If the parabola only has 1 x-intercept see middle of picture below , then the parabola is said to be tangent to the x-axis. Simply solve the quadratic equation by any of the following methods.

## How Do You Graph a Quadratic Equation in Intercept Form?

In algebra, 2-dimensional coordinate graphs have a horizontal axis, or x-axis, and a vertical axis, or y-axis. The places where lines representing a range of values cross these axes are called intercepts. The y-intercept is the place where the line crosses the y-axis and the x-intercept where the line crosses the x-axis. For simple problems, it is easy to find the x-intercept by looking at a graph. You can find the exact point of the intercept by solving algebraically using the equation of the line. To find the x intercept using the equation of the line, plug in 0 for the y variable and solve for x. You can also use the graph of the line to find the x intercept.

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