Khan Academy / High School / Math
Lecture : Introduction to the quadratic equation
By Salman Khan | Algebra I Review - High School
Lecture 34 of 83
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 More Lectures - Select Lecture...1 : Simple Equations2 : Equations 23 : Equations 34 : Algebra Linear Equations 45 : Algebra: Solving Inequalities6 : Algebra graphing lines 17 : Graphing linear equations8 : Algebra Slope9 : Algebra Slope 210 : Algebra Slope 311 : Algebra Equation of a line12 : Slope and Y intercept Intuition13 : Averages14 : Integer sums15 : Taking percentages16 : Growing by a percentage17 : Another Percent Word Problem18 : More percent problems19 : systems of equations20 : Introduction to Ratios21 : Ratio problem with basic algebra22 : More advanced ratio problem with Algebra23 : Alternate Solution to Ratio Problem24 : Introduction to Ratios part - 125 : Advanced ratio problems26 : Age word problems 127 : Age word problems 228 : Age word problems 329 : Level 1 multiplying expressions30 : Solving a quadratic by factoring31 : i and Imaginary numbers32 : Complex Numbers - part 133 : Complex Numbers part 234 : Introduction to the quadratic equation35 : Quadratic Equation part 236 : Completing the square37 : Quadratic Formula38 : Quadratic Inequalities39 : Quadratic Inequalities (Visual Explanation)40 : Introduction to functions41 : Functions Part 242 : Functions Part III43 : Functions part 444 : Domain of a function45 : Proof: log a log b = log ab46 : Proof: A(log B) = log (B^A), log A - log B = log (A-B)47 : Proof: log_a (B) = log_x (B))(log_x (A)48 : Algebraic Long Division49 : Introduction to Conic Sections50 : Conic Sections: Intro to Circles51 : Conic Sections: Intro to Ellipses52 : Conic Sections: Intro to Hyperbolas53 : Conic Sections: Hyperbolas 254 : Conic Sections: Hyperbolas 355 : Identifying Conics 156 : Identifying Conics 257 : Conic Identification 358 : Foci of an Ellipse59 : Foci of a Hyperbola60 : Proof: Hyperbola Foci61 : Partial Fraction Expansion 162 : Partial Fraction Expansion 263 : Partial Fraction Expansion 364 : Parabola Focus and Directrix 165 : Focus and Directrix of a Parabola 266 : Two Passing Bicycles Word Problem67 : Passed Bike Word Problem68 : Passing Trains69 : Overtaking Word Problem70 : Early Train Word Problem71 : Officer on Horseback72 : Rational Inequalities73 : Rational Inequalities 274 : Interesting Polynomial Coefficient Problem75 : Geometric series sum to figure out mortgage payments76 : Introduction to Function Inverses77 : Function Inverse Example 178 : Function Inverses Example 279 : Function Inverses Example 380 : Direct and Inverse Variation81 : Recognizing Direct and Inverse Variation82 : Recognizing Odd and Even Functions83 : Connection between even and odd numbers and functions

Course Description

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Courses Index
1 : Geometry   (Multiple Instructors / Brightstorm)
3 : Geometry – Worked Examples   (Salman Khan / Khan Academy)
4 : Fundamentals of Geometry   (James Sousa / MathIsPower4U)
5 : Algebra II   (Multiple Instructors / Brightstorm)
6 : Algebra II – 10th grade   (Derek Owens / Derek Owens)
7 : Algebra I - Martin Gay Textbook   (Julie Harland / MathGal)
8 : Algebra II - 2008 Prentice Hall Algebra 2 Textbook   (Brad Robb / WowMath)
9 : Algebra II – Worked Examples   (Salman Khan / Khan Academy)
10 : Algebra II - Worked Problems   (Brad Robb / WowMath)
11 : Pre-Calculus   (Multiple Instructors / Brightstorm)