Khan Academy
Solving Quadratic Equations by Square Roots, Algebra II
Introducing square roots into the quadratic equation mix, Sal addresses the ways viewers might solve the problems, both correctly and incorrectly. The video is an integral step in not only Sal's algebra series but also in developing math...
Khan Academy
SAT Prep: Test 5 Section 7 Part 3
The most helpful part of this video is at the very end, when Sal demonstrates how to solve a combinations problem incorrectly (after initially finding the correct answer). The trial-and-error strategy of solving multiple-choice math...
Khan Academy
Factoring Special Products, Polynomial and Rational Functions, Algebra II
"Just to get the point drilled into your head," Sal continues his lecture on factoring quadratic expressions, focusing on special products. He works to instill the problem-solving skills necessary to factor in equations quickly and...
Khan Academy
SAT Prep: Test 3 Section 4 Part 2
Sal explains how helping his young cousins with their math skills inspired him to make this series of videos, so he can help a bunch of people pass the SAT. In this video, he covers exponents, quadratics, and parabolas in problems 5-9 on...
Khan Academy
SAT Prep: Test 4 Section 2 Part 2
Sal clarifies that doing a math problem the correct way isn't really the correct way to do it on the SAT. If students find this statement confusing, they will understand Sal's point after watching him work quickly and efficiently through...
Khan Academy
SAT Prep: Test 1 Section 6 Part 1
Here, Sal begins section 6 on page 407 of The Official SAT Study Guide, focusing on problems 1-4 in this video. He clarifies that SAT questions are "tricky, but really fast" problems that shouldn't take a lot of time to solve. To prove...
Curated OER
SAT Prep: Test 3 Section 4 Part 5
The last part of problem 18 is the focus of this short video. Sal picks up where he left off, factoring the end of the linear equation, and reminding students to view his video on factoring if they are still confused.
Khan Academy
SAT Prep: Test 2 Section 9 Part 3
Carefully reading word problems is a skill that many students neglect due to time constraints or test anxiety, and Sal models how to do so in this video. Both algebra and geometry are featured in problems 10-12 of the practice SAT.
Curated OER
Solving Quadratic Equations by Graphing
With his trusty graphing calculator, Sal begins his lecture on solving quadratic functions by graphing. The video is a good way to show young mathematicians not only how to use the graphing calculator (which Sal describes as "archaic"...
Flipped Math
Quadratic Formula
The quadratic formula is what works—always. Instruct your classes on the application of the quadratic formula using a thorough video lesson followed by provided practice problems. The lesson connects algebraic solutions to graphical...
Flipped Math
Completing the Square
No unit on quadratics is complete without completing the square. The fourth of five videos in Algebra I Unit 11 first reviews perfect squares and perfect square trinomials. Viewers learn how to rewrite quadratic equations in (x - p)^2 =...
Flipped Math
The Quadratic Formula
It just takes one formula to solve them all. By watching a video, pupils learn to solve quadratic equations using the quadratic formula. Some equations require rewriting the equations in standard form before identifying the values of a,...
Flipped Math
Solve Quadratic Equations Using Square Roots
Not having an x term makes things so much easier. The second of five installments in Algebra I Unit 11 focuses on solving quadratic equations by taking square roots. Scholars learn to solve equations of the form ax^2 + c = d by watching...
Flipped Math
Quadratics in Standard Form
Get ready to set the standard! Pupils watch a video on how to graph a parabola from a quadratic in standard form without converting the form. Scholars learn how to find the axis of symmetry from the equation and from there the vertex....
Flipped Math
Quadratics in Vertex Form
It looks different, but yet the same. Scholars view a video that introduces them to the vertex form for a quadratic equation. Pupils realize that though the equation looks different, its graph is still a parabola, and the key features...
Mathispower4u
Quadratic Equation Application - Evaluate and Factor (Example)
Attain new heights in understanding quadratics. An educational video explores how to evaluate quadratic equations to solve problems in context. It also looks at how to factor quadratics. The equation gives the height of debris over time...
Mathispower4u
Evaluate a Quadratic Equation - Death Application
Don't be bored to death when learning about quadratics. Using a given quadratic equation representing the number of deaths per year per thousand people in terms of age, scholars determine the number of deaths for a particular age group....
Mathispower4u
Writing Equations from Tables - Squaring
By watching an informative video, young mathematicians learn how to write an equation from a table. In this case, the underlying equation is no longer linear, but rather it is quadratic.
Corbett Maths
Sketching Quadratics
Sketch the graph of quadratic functions using key features as a guide. After a brief discussion about the key features of a parabola, the video instructor completes several examples showing how to graph a quadratic function. Each...
Corbett Maths
Solving Quadratics Graphically – Advanced
Use an understanding of equality to find solutions of quadratics graphically. A well-designed lesson illustrates the relationship between the right and left sides of an equation graphically. With one side quadratic and the other side...
Corbett Maths
Solving Quadratics Graphically
One of the many methods of solving quadratic equations is graphing. A video lesson first demonstrates graphing a quadratic function using an input-output table. After graphing the parabola, the instructor makes the connection between the...
Corbett Maths
Deriving the Quadratic Formula
Formulas don't appear from thin air! Learn how to derive the quadratic formula by completing the square. As the video instructor demonstrates each step of the derivation, the quadratic formula begins to emerge until it is complete in the...
Corbett Maths
Quadratic Formula
When all else fails, use the quadratic formula! A video lesson introduces the quadratic formula to scholars and then demonstrates two problems. One problem results in integer solutions, the other in irrational solutions.
Corbett Maths
Drawing Quadratics
Map the input to the output and see what pupils create. The video lesson provides an introduction to graphing quadratic functions using an input-output table. The instructor shows each step of the calculations when evaluating the function.