Curated OER
What is the Discriminant?
Introduce learners to the discriminant. The discriminant, used to find the number of real solutions to a quadratic equation, is part of the quadratic formula. The video shows where in the formula you can find it, and provides an example...
Khan Academy
Khan Academy: Algebra: Completing the Square for Quadratic Equations
Demonstrates how to complete the square for the general form of a quadratic equation, ax^2 + bx + c = 0, which results in the quadratic formula. [9:31]
Khan Academy
Khan Academy: Algebra: Applying Quadratic Functions 2
Video solving an application problem by finding a quadratic equation to represent the distance of a diver above the water based on his time in the air by determining his average velocity. Equation is solved using the quadratic formula....
Khan Academy
Khan Academy: Algebra: Quadratic Formula 2
Demonstrates how to solve a quadratic equation that begins in the form ax^2 + bx = c using the quadratic formula. [6:40]
Khan Academy
Khan Academy: Algebra: Quadratic Formula 1
Demonstrates how to use the quadratic formula to solve a quadratic equation with a negative leading coefficient. [5:34]
Khan Academy
Khan Academy: Algebra: Quadratic Formula (Proof)
Explains how to derive the quadratic formula by completing the square on the standard form of a quadratic equation. [7:34]
Khan Academy
Khan Academy: Algebra: Proof of Quadratic Formula
Demonstrates how to derive the quadratic formula from the standard form of a quadratic equation by completing the square. This video also appears in the Algebra: ck12.org strand. [7:44]
Khan Academy
Khan Academy: Algebra: Ca Algebra I: Quadratic Equation
Demonstrates solutions to problems #53-57 of California Algebra I released state test questions. Problems address an understanding of solving quadratic equations by completing the square and the quadratic formula. [10:14]
Khan Academy
Khan Academy: Algebra: Discriminant for Types of Solutions for a Quadratic
Explains how to interpret the value of the discriminant to determine the number and types of solutions of a quadratic equation. [4:37]
Khan Academy
Khan Academy: Algebra: Complex Numbers: Complex Roots From the Quadratic Formula
Video shows how to use the quadratic formula to find roots of a quadratic equation in a situation where the roots are complex. Includes showing how to verify the answers are correct solutions of the quadratic. [10:15]
Khan Academy
Khan Academy: Algebra Ii: Quadratics and Shifts
Demonstrates solutions to four problems. Problems address understanding of quadratic equations, ways to solve quadratic equations, and translations of graphs of quadratic equations. Practice problems available. [11:53]
Khan Academy
Khan Academy: Algebra: Discriminant of Quadratic Equations
Identifies the quadratic formula and discusses what the values of the discriminant indicate about the number and types of solutions for a given quadratic equation. This video also appears in the Algebra: ck12.org strand. [10:14]
Khan Academy
Khan Academy: Algebra: Application Problem With Quadratic Formula
Explains how to solve a word problem regarding the amount of time it takes for a ball to hit the ground after being shot off a building by using the quadratic formula to find solutions to the given equation. [5:53]
Khan Academy
Khan Academy: Algebra Ii: Examples: Graphing and Interpreting Quadratics
Demonstrates solutions to three problems. Problems address understanding of graphs of quadratic equations and translations of graphs of quadratic equations. [11:31]
Khan Academy
Khan Academy: Algebra: Quadratic Equation Part 2
Explains how to use the quadratic formula to find the solutions to a quadratic equation. Two different examples are solved. [9:14]
Khan Academy
Khan Academy: Algebra: Applying the Quadratic Formula
Demonstrates how to find the solutions of a given quadratic equation with a negative leading coefficient using the quadratic formula. [4:51]
Khan Academy
Khan Academy: Algebra: Introduction to the Quadratic Equation
Explains how to solve quadratic equations, or find the roots of the equation, by factoring and by using the quadratic formula. Three different equations are solved. [9:14]
Virtual Nerd
Virtual Nerd: Solving Quadratic Equations by Inspection, Taking Square Roots
Pick from a variety of tutorials to teach how to solve quadratic equations using various methods.
Khan Academy
Khan Academy: The Quadratic Formula: Using the Quadratic Formula
Demonstrates how to solve a quadratic equation using the quadratic formula.
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: Algebra: Quadratic Formula Proof
Students learn how to derive the quadratic formula by completing the square. The video tutorial investigates the mathematics concept through detailed notes and examples.
Khan Academy
Khan Academy: Quadratic Odds and Ends: Quadratic Formula (Proof)
Deriving the quadratic formula by completing the square.
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: Quadratic Odds and Ends: Quadratic Equation
This video demonstrate an understanding of solving quadratic equations by completing the square and using the quadratic formula.