Khan Academy
Khan Academy: The Quadratic Formula: Example 1: Using the Quadratic Formula
Demonstrates how to use the quadratic formula to solve a quadratic equation with a negative leading coefficient.
Khan Academy
Khan Academy: The Quadratic Formula: Proof of Quadratic Formula
Demonstrates how to derive the quadratic formula from the standard form of a quadratic equation by completing the square.
Khan Academy
Khan Academy: The Quadratic Formula: Example 3: Using the Quadratic Formula
Explains how to determine the number of solutions a quadratic equation has based on the value of the discriminant.
Khan Academy
Khan Academy: Example 4: Solving a Quadratic Equation by Factoring
Applications Problem Factoring Quadratics.
Sophia Learning
Sophia: Figuring Out the Discriminant
Students learn how to determine the discriminant and use it to find the real solutions to a quadratic equation. Videos and graphs are included in the resource.
Sophia Learning
Sophia: Graphing a Quadratic Equation (Parabola Anatomy)
This video lesson demonstrates how to graph a quadratic equation and provides definitions for key vocabulary related parabolas.
Sophia Learning
Sophia: Properties of Equilateral Triangles
Equilateral triangles are explored in this learning tutorial, which includes several videos [4:18; 4:18; 3:18] and a PowerPoint presentation. The lesson includes an introduction of equilateral triangles and their key characteristics....
Randy Thomas
Solving Quadratic Equations With Complex Solutions
This tutorial discusses solving quadratic equations using square roots, completing the square, and the quadratic formula. Problems which previously had no solution can now be solved with the inclusion of the complex number system....
Other
How to Get the Equation of a Parabola Given Its Intercepts and a Point
This video by teacher Nathan Oldridge explains how to determine the quadratic equation of a parabola from its intercepts and a point on the graph. Video is accompanied by a running transcript. [5:54]
Khan Academy
Khan Academy: Quadratic Equations: Completing the Square for Vertex Form
A video about using the completing the square method to write a quadratic equation. [6:14]
Khan Academy
Khan Academy: Quadratic Odds and Ends: Introduction to the Quadratic Equation
The video demonstrates how to use the quadratic equation to solve second degree polynomials.
Khan Academy
Khan Academy: The Quadratic Formula: Applying the Quadratic Formula
This video shows an application problem with Quadratic Formula.
Khan Academy
Khan Academy: The Quadratic Formula: Example: Quadratics in Standard Form
Identifies the standard form of a quadratic equation and models how to put a given quadratic equation into standard form
Khan Academy
Khan Academy: Quadratic Odds and Ends: Quadratic Equation Part 2
A video showing examples of solving equations using the quadratic equation.
Khan Academy
Khan Academy: The Quadratic Formula: How to Use the Quadratic Formula
Introduction to using the quadratic formula.
Khan Academy
Khan Academy: Algebra: Quadratic Equation 2
Students learn how to solve equations using the quadratic equation. The video tutorial investigates the mathematics concept through detailed notes and examples.
Sophia Learning
Sophia: Solving Quadratic Equations Representing Area #2
In this lesson, students will learn Solving Quadratic Equations Representing Area
Sophia Learning
Sophia: Locating the Maximum and Minimum of a Parabola
This video tutorial describes how to determine if the vertex of a parabola is the minimum or maximum. The lesson includes a detailed example.