The quadratic formula
16:32
Khan AcademySal Khan
The quadratic formula
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.
Feb 20, 2011
Khan Academy Algebra
Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
7:28
Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
YouTubeKhan Academy
2.9M viewsNov 19, 2006
Solving a more complicated equation | Linear equations | Algebra I | Khan Academy
8:41
Solving a more complicated equation | Linear equations | Algebra I | Khan Academy
YouTubeKhan Academy
2M viewsSep 15, 2010
How to solve one-step equations | Linear equations | Algebra I | Khan Academy
2:09
How to solve one-step equations | Linear equations | Algebra I | Khan Academy
YouTubeKhan Academy
1.1M viewsSep 11, 2012
Top videos
Polynomial identities introduction
4:56
Polynomial identities introduction
Khan Academy
Jun 18, 2019
Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
0:31
Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
FacebookKhan Academy
17.2K viewsApr 25, 2018
Subtracting: three digit numbers and basic regrouping | Arithmetic | Khan Academy
2:47
Subtracting: three digit numbers and basic regrouping | Arithmetic | Khan Academy
YouTubeKhan Academy
1M viewsOct 4, 2013
Khan Academy Calculus
Antiderivatives and indefinite integrals | AP Calculus AB | Khan Academy
3:43
Antiderivatives and indefinite integrals | AP Calculus AB | Khan Academy
YouTubeKhan Academy
1.6M viewsJan 25, 2013
L'Hôpital's rule example 1 | Derivative applications | Differential Calculus | Khan Academy
7:43
L'Hôpital's rule example 1 | Derivative applications | Differential Calculus | Khan Academy
YouTubeKhan Academy
735.6K viewsJun 7, 2010
Integration by parts: definite integrals | AP Calculus BC | Khan Academy
5:43
Integration by parts: definite integrals | AP Calculus BC | Khan Academy
YouTubeKhan Academy
135.4K viewsAug 1, 2017
Polynomial identities introduction
4:56
Polynomial identities introduction
Jun 18, 2019
Khan Academy
Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
0:31
Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
17.2K viewsApr 25, 2018
FacebookKhan Academy
Subtracting: three digit numbers and basic regrouping | Arithmetic | Khan Academy
2:47
Subtracting: three digit numbers and basic regrouping | Arithmetic | Khan Academy
1M viewsOct 4, 2013
YouTubeKhan Academy
Introduction to solubility equilibria | Equilibrium | AP Chemistry | Khan Academy
8:17
Introduction to solubility equilibria | Equilibrium | AP Chemistry | Khan Academy
96.5K viewsJul 8, 2021
YouTubeKhan Academy
Introduction to subtraction | Basic addition and subtraction | Early Math | Khan Academy
3:38
Introduction to subtraction | Basic addition and subtraction | Early Math | Khan Academy
518K viewsJun 2, 2015
YouTubeKhan Academy
How to test solutions to equations using substitution | 6th grade | Khan Academy
3:44
How to test solutions to equations using substitution | 6th grade | Khan Academy
388K viewsOct 15, 2014
YouTubeKhan Academy
Graphs of linear equations | Linear equations and functions | 8th grade | Khan Academy
13:10
Graphs of linear equations | Linear equations and functions | 8th grade | Khan Academy
1.8M viewsApr 3, 2010
YouTubeKhan Academy
3:52
Integration by parts intro | AP Calculus BC | Khan Academy
1M viewsJan 28, 2013
YouTubeKhan Academy
3:20
Dividing polynomials 1 | Polynomial and rational functions | Algebra II | Khan Academy
778.6K viewsJan 27, 2011
YouTubeKhan Academy
5:21
Synthetic division | Polynomial and rational functions | Algebra II | Khan Academy
1.4M viewsAug 1, 2012
YouTubeKhan Academy
8:45
Basic Trigonometry
2.6M viewsAug 13, 2007
YouTubeKhan Academy
6:18
Slope from equation | Mathematics I | High School Math | Khan Academy
136.1K viewsMar 27, 2017
YouTubeKhan Academy
3:57
Addition using groups of 10 and 100 | 2nd grade | Khan Academy
346.7K viewsAug 14, 2017
YouTubeKhan Academy
8:36
Acceleration | Motion | Physics class 9 | Khan Academy
8K viewsDec 27, 2023
YouTubeKhan Academy India - English
2:27
Quadratic equations | Worked example | Praxis Core Math | Khan Academy
4K viewsApr 11, 2019
YouTubeKhan Academy Praxis
9:49
Introduction to Logarithms
2.3M viewsMay 17, 2007
YouTubeKhan Academy
7:02
Logarithms | Logarithms | Algebra II | Khan Academy
2.2M viewsDec 21, 2012
YouTubeKhan Academy
2:07
Example 3: Subtracting polynomials | Algebra I | Khan Academy
498.6K viewsJan 27, 2011
YouTubeKhan Academy
3:37
Example 1: Simplifying polynomials | Algebra I | Khan Academy
700K viewsJan 27, 2011
YouTubeKhan Academy
2:01
Example 2: Adding polynomials | Algebra I | Khan Academy
926.9K viewsJun 21, 2010
YouTubeKhan Academy
1:44
Adding and subtracting polynomials | Algebra Basics | Khan Academy
577K viewsJun 21, 2010
YouTubeKhan Academy
4:15
Fraction basics | Fractions | 3rd grade | Khan Academy
1.3M viewsOct 7, 2013
YouTubeKhan Academy
6:25
Introduction to decimals | Decimals | 4th grade | Khan Academy
1.2M viewsJun 8, 2015
YouTubeKhan Academy
4:29
Introduction to the matrix | Matrices | Precalculus | Khan Academy
1.1M viewsFeb 22, 2013
YouTubeKhan Academy
8:10
Polynomial end behavior | Polynomial and rational functions | Algebra II | Khan Academy
739K viewsDec 19, 2013
YouTubeKhan Academy
4:45
Basic linear equation word problem | 7th grade | Khan Academy
517.6K viewsSep 11, 2015
YouTubeKhan Academy
15:27
Multiplication 2: The multiplication tables | Arithmetic | Khan Academy
1.6M viewsSep 18, 2009
YouTubeKhan Academy
5:08
Multiplying 10s | Math | 4th grade | Khan Academy
454.8K viewsAug 18, 2016
YouTubeKhan Academy
7:28
Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
2.9M viewsNov 19, 2006
YouTubeKhan Academy
See more