The directrix and focus of a parabola determine its shape, size, and direction. There is a formula for finding the directrix and focus. Examples are included.

Learn how to find the focus and directrix of a parabola and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to find the equation of a parabola with its focus and directrix in this bite-sized video lesson. Enhance your geometry skills by taking a quiz for practice.

Learn how to derive the equation of a parabola given its focus and directrix, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to find the directrix from the general form of an equation, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to find the focus and directrix of a parabola in vertex form, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

A parabola is a curve in which each point on the curve is equidistant from another point called a focus and a straight line called a directrix. A parabola equation has the parent equation of y=x^2 ...

Master the directrix and focus of a parabola with our concise video lesson. Learn the equation and see examples, followed by a quiz to test your understanding.

Directrix of a Parabola: In mathematics, a parabola is the graph of a quadratic equation that has the shape of a U or an upside down U. This is most often how a parabola is defined in mathematics. …

The focus and the directrix are the point and line, respectively, upon which the definition of a parabola depends. They are point F and the x-axis in Figure 2.