Sal first solves a couple of equations using the factoring method he has already taught. Next, he introduces the quadratic formula and demonstrates how to plug the numbers from the quadratic equation into the quadratic formula. Step-by-step, he demonstrates how to solve quadratic formula to get the roots.
The instructor continues solving quadratic equations by plugging values into the quadratic formula. These examples are a bit more difficult because the answers do not work out to whole numbers.
Introducing square roots into the quadratic equation mix, Sal takes care to address the ways viewers might go about solving the problems, both correctly and incorrectly. The video is an integral step in not only Sal's algebra series, but also in a developing math education.
Defining the word "discriminant" in the context of the quadratic formula, Sal continues to guide viewers through the process of quadratic equations. The true value of this video, as in Sal's entire series, is the emphasis on truly understanding the mathematical process necessary to solve the problem. Sal wants to foster a deeper learning within young mathematicians, rather than just handing them a formula and telling them to use it.
"The neat thing about completing the square is that it will always work," Sal explains, "no matter how crazy the problem is." A basic overview of how to complete the square, this video provides a good background for both beginning and advanced learners who are working on quadratics.
Use an informative video on the quadratic equation to help math learners of all levels. Remember that if there is a solution, there will be two values. In word problems, it might be that only one of the values might answer the question. But in a regular number problem, there are two values for the solution.
There are many ways to solve a quadratic equation. Let's check out how to solve a quadratic equation by graphing. But first, let's find the axis of symmetry and the vertex before making a table of values. Write the values as ordered pairs and then graph them. Wait, the parabola does not cross the x-axis. What does that mean? Follow along as the instructor explains just what that means.
Students explore a variety of ways of solving quadratic equations. Students choose from graphing, factoring, finding square roots, completing the square and using the Quadratic formula. They ponder in the end on polynomial equations.
"Quadratic Chutes and Ladders" helps the class review how to solve quadratic equations using four different methods. They solve each equation by completing the square, using the quadratic formula, graphing, or factoring depending on the number rolled on dice. A fun way to review some difficult concepts.
Eleventh graders explore quadratic equations.  In this Algebra II lesson, 11th graders use Geometer’s Sketchpad to explore the properties of quadratics and the connections with polynomials and linear equations.  The lesson is designed as an introduction and quadratic equations are not introduced until the end.
Students create quadratic equations and factor out to find the roots. In this algebra instructional activity, students watch a short video on how to factor trinomials. They are taught two methods and given the option to use either method.
Students differentiate and convert between rational roots and quadratic equations. In this algebra lesson plan, students solve quadratic and rational expressions finding the roots or intercepts of the graphs of a quadratic and linear equation. They relate the functions to the real world.
For this Algebra II worksheet, 11th graders use an online quadratic equation solver to find the zeros of a quadratic.  The one page interactive worksheet provides one worked example and the equation solver. 
A quadratic equation can have two solutions, one solution, or no solutions. The discriminant is part of the quadratic formula and can be used to find out how many answers a quadratic equation has. Watch this video and learn all about the discriminant and how to determine how many solutions the quadratic equation has.
What is the discriminant? The what? The discriminant? It has something to do with quadratic equations. It's used to determine how many answers a quadratic equation has, but what is it? It's an equation that is actually a part of the quadratic formula. So after plugging values into the formula and solving it can be determined how many answers the equation has. Want to know how? Watch this video.
Use the quadratic formula to solve a quadratic equation. Set the quadratic equation equal to zero. Identify the coefficient values and plug them in to the quadratic formula. Solve the equation. What? No solution. Really? Watch this video and check out how to identify that there is no real solution.
How can you determine if a quadratic equation has no solutions before the problems is solved? Use the discriminant! What's the discriminant? It's part of the quadratic formula. Watch the instructor go through the necessary steps to use the discriminant.
The discriminant is part of the quadratic formula. A quadratic equation can have two solutions, one solution, or no solutions. The discriminant can be used to determine how many answers a quadratic equation has. Want to know how to use the discriminant, then watch this video.
What's a quadratic equation? How many ways can a quadratic equation be solved? Does a quadratic equation have to have a term in it that is squared? What about a cubed term? What does the graph of a quadratic equation look like? There are four ways to solve a quadratic equation. Want to know what they are? Then watch this video.
Completing the square is an effective way to solve a quadratic equation. Introduce your class to this technique and use this video to complement your lesson. This resource takes viewers through the process of completing the square, solving the quadratic equation , and checking answers, explaining each step along the way. A great resource.

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