Khan Academy
Learn how to use the quadratic formula to solve quadratic equations with step-by-step guidance.
Khan Academy
Learn about quadratic functions and equations with videos, practice problems, and interactive exercises on Khan Academy.
How to use the quadratic formula | Polynomial and rational …
Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadr...
Solving a quadratic equation by factoring | Algebra II | Khan Academy ...
2010年6月23日 · Algebra II on Khan Academy: Your studies in algebra 1 have built a solid foundation from which you can explore linear equations, inequalities, and functions. In algebra 2 we build upon that...
Khan Academy
Sal solves the equation s^2-2s-35=0 by factoring the expression on the left as (s+5)(s-7) and finding the s-values that make each factor equal to zero. Created by Sal Khan and Monterey Institute for Technology and Education.
Example 2: Using the quadratic formula | Quadratic equations
Quadratic Formula 2 Practice this lesson yourself on KhanAcademy.org right now: https://www.kh...more. Courses on Khan Academy are always 100% free. Start practicing—and saving...
The quadratic formula - Khan Academy
The quadratic formula helps us solve any quadratic equation. First, we bring the equation to the form ax²+bx+c=0, where a, b, and c are coefficients. Then, we plug these coefficients in the formula: (-b±√(b²-4ac))/(2a) . See examples of using the formula to solve a variety of equations.
Understanding the quadratic formula - Khan Academy
Gain more insight into the quadratic formula and how it is used in quadratic equations. The quadratic formula helps you solve quadratic equations, and is probably one of the top five formulas in math.
Khan Academy
Sal solves the equation 4x^2+40x+280=0 by completing the square, only to find there's no solution for this equation.
Example 1: Using the quadratic formula | Quadratic equations
Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra-home/alg-quadratics/alg...