Variables Expressions and Equations Variables Expressions and EquationsIntroduction and examples of variables, expressions and equationsMore free lessons at: http://www.khanacademy.org/video?v=vDqOoI-4Z6MFrom:Khan AcademyViews:475381 1394ratingsTime:06:55More inEduca… - 17 Feb 12, 8:59pm -
Descartes and Cartesian Coordinates Descartes and Cartesian CoordinatesBridging algebra and geometry. What makes linear equations so linear.More free lessons at: http://www.khanacademy.org/video?v=N4nrdf0yYfMFrom:Khan AcademyViews:626810 1089ratingsTime:11:22More in… - 15 Feb 12, 10:38pm -
Abstract-ness Abstract-nessThe general idea behind the word 'abstract'More free lessons at: http://www.khanacademy.org/video?v=ZOYRb2sYrL0From:Khan AcademyViews:429971 1019ratingsTime:07:00More inEducation - 9 Feb 12, 9:56pm -
Origins of Algebra Origins of AlgebraWhere did the word "Algebra" and its underlying ideas come fromMore free lessons at: http://www.khanacademy.org/video?v=_LDR1_PrveoFrom:Khan AcademyViews:827566 1607ratingsTime:07:18More inEducation - 9 Feb 12, 8:21pm -
The Beauty of Algebra The Beauty of AlgebraWhy the abstraction of mathematics is so fundamentalMore free lessons at: http://www.khanacademy.org/video?v=kpCJyQ2usJ4From:Khan AcademyViews:1871068 6330ratingsTime:10:07More inEducation - 9 Feb 12, 6:21pm -
i as the Principal Root of -1 (a little technical) i as the Principal Root of -1 (a little technical)i as the principal square root of -1More free lessons at: http://www.khanacademy.org/video?v=rYG1D5lUE4IFrom:Khan AcademyViews:115328 217ratingsTime:06:45More inEducation - 11 Jul 11, 11:38pm -
Calculating i Raised to Arbitrary Exponents Calculating i Raised to Arbitrary ExponentsCalculating i raised to arbitrarily high exponentsMore free lessons at: http://www.khanacademy.org/video?v=QiwfF83NWNAFrom:Khan AcademyViews:195562 246ratingsTime:06:21More inEducation - 11 Jul 11, 11:03pm -
Introduction to i and Imaginary Numbers Introduction to i and Imaginary NumbersIntroduction to i and imaginary numbersMore free lessons at: http://www.khanacademy.org/video?v=ysVcAYo7UPIFrom:Khan AcademyViews:386532 551ratingsTime:05:20More inEducation - 11 Jul 11, 10:24pm -
Another Percent Word Problem Another Percent Word ProblemFinding the full price when you know the discount priceMore free lessons at: http://www.khanacademy.org/video?v=d1oNF88SAggFrom:Khan AcademyViews:234372 275ratingsTime:06:18More inEducation - 5 Mar 10, 4:08pm -
Slope and Y-intercept Intuition Slope and Y-intercept IntuitionUsing the "Graph of a line" module to understand how a line's graph changes when its slope or y-intercept is changed.More free lessons at: http://www.khanacademy.org/video?v=8sz1IPjBRS8From:Khan AcademyViews:28… - 8 Nov 09, 8:17pm -
Introduction to Ratios (new HD version) Introduction to Ratios (new HD version)What a ratio is. Simple ratio problems.More free lessons at: http://www.khanacademy.org/video?v=HpdMJaKaXXcFrom:Khan AcademyViews:747076 1130ratingsTime:14:13More inEducation - 5 Nov 09, 8:49pm -
Alternate Solution to Ratio Problem (HD Version) Alternate Solution to Ratio Problem (HD Version)An alternate solution to the advanced ratio problem in the last video.More free lessons at: http://www.khanacademy.org/video?v=-xyTz0WZ1W4From:Khan AcademyViews:53205 86ratingsTime:07:0… - 5 Nov 09, 8:49pm -
More advanced ratio problem--with Algebra (HD version) More advanced ratio problem--with Algebra (HD version)More advance ratio problem with algebra.More free lessons at: http://www.khanacademy.org/video?v=ItA_hhRtUuwFrom:Khan AcademyViews:98928 144ratingsTime:09:58More inEducation - 5 Nov 09, 8:49pm -
Ratio problem with basic algebra (new HD) Ratio problem with basic algebra (new HD)A slightly more involved ratio problem with algebraMore free lessons at: http://www.khanacademy.org/video?v=ITVQrzDSekUFrom:Khan AcademyViews:207407 220ratingsTime:05:12More inEducation - 5 Nov 09, 8:49pm -
Quadratic Formula (proof) Quadratic Formula (proof)Deriving the quadratic formula by completing the square.More free lessons at: http://www.khanacademy.org/video?v=mDmRYfma9C0From:Khan AcademyViews:164371 416ratingsTime:07:34More inEducation - 18 Jun 08, 4:28am -
Completing the square Completing the squareSolving a quadratic by completing the square.From:Khan AcademyViews:483422 1442ratingsTime:13:45More inEducation - 18 Jun 08, 12:49am -
Functions (part 4) Functions (part 4)An example of a functions problem submitted by a youtube viewerMore free lessons at: http://www.khanacademy.org/video?v=rbt51hXmzigFrom:Khan AcademyViews:197801 331ratingsTime:06:08More inEducation - 22 Nov 07, 6:14am -
Solving a quadratic by factoring Solving a quadratic by factoringfactoring quadraticsMore free lessons at: http://www.khanacademy.org/video?v=N30tN9158KcFrom:Khan AcademyViews:313425 348ratingsTime:09:12More inEducation - 28 Oct 07, 4:54pm -
Algebra: Linear Equations 4 Algebra: Linear Equations 4Solving linear equations with variable expressions in the denominators of fractionsMore free lessons at: http://www.khanacademy.org/video?v=9IUEk9fn2VsFrom:Khan AcademyViews:791127 892ratingsTime:07:39More… - 28 Oct 07, 4:54pm -
Algebra: Slope 2 Algebra: Slope 2Second part of determining the slope of a lineFrom:Khan AcademyViews:217988 318ratingsTime:09:46More inEducation - 28 Oct 07, 4:53pm -
Algebra: Slope and Y-intercept intuition Algebra: Slope and Y-intercept intuitionGetting a feel for slope and y-interceptMore free lessons at: http://www.khanacademy.org/video?v=Nhn-anmubYUFrom:Khan AcademyViews:339426 379ratingsTime:08:37More inEducation - 28 Oct 07, 4:53pm -
Algebra: Equation of a line Algebra: Equation of a lineDetermining the equation of a lineMore free lessons at: http://www.khanacademy.org/video?v=gvwKv6F69F0From:Khan AcademyViews:310518 540ratingsTime:06:46More inEducation - 28 Oct 07, 4:53pm -
Age word problems 2 Age word problems 2Second set of age word problemsMore free lessons at: http://www.khanacademy.org/video?v=pPqPj8CAPvIFrom:Khan AcademyViews:124861 157ratingsTime:09:57More inEducation - 28 Oct 07, 4:53pm -
Age word problems 3 Age word problems 3Part 3 of the presentation on age word problemsMore free lessons at: http://www.khanacademy.org/video?v=DplUpe3oyWoFrom:Khan AcademyViews:114127 111ratingsTime:04:10More inEducation - 28 Oct 07, 4:53pm -
Age word problems 1 Age word problems 1Age word problemsMore free lessons at: http://www.khanacademy.org/video?v=bAUT_Pux73wFrom:Khan AcademyViews:257279 318ratingsTime:07:14More inEducation - 28 Oct 07, 4:53pm -
systems of equations systems of equationssystems of equationsMore free lessons at: http://www.khanacademy.org/video?v=nok99JOhcjoFrom:Khan AcademyViews:341650 715ratingsTime:09:58More inEducation - 28 Oct 07, 4:53pm -
Introduction to the quadratic equation Introduction to the quadratic equationIntroduction to using the quadratic equation to solve 2nd degree polynomialsMore free lessons at: http://www.khanacademy.org/video?v=IWigvJcCAJ0From:Khan AcademyViews:378303 681ratingsTime:09:15… - 28 Oct 07, 4:51pm -
Quadratic Equation part 2 Quadratic Equation part 22 more examples of solving equations using the quadratic equationMore free lessons at: http://www.khanacademy.org/video?v=y19jYxzY8Y8From:Khan AcademyViews:201949 322ratingsTime:09:14More inEducation - 28 Oct 07, 4:51pm -
Introduction to Ratios Introduction to RatiosBasic ratio problems. (from KhanAcademy.org)From:Khan AcademyViews:208498 394ratingsTime:07:28More inEducation - 28 Oct 07, 4:51pm -
Functions Part 2 Functions Part 2More examples of solving function problemsMore free lessons at: http://www.khanacademy.org/video?v=XEblO51pF5IFrom:Khan AcademyViews:416073 898ratingsTime:09:54More inEducation - 28 Oct 07, 4:50pm -
Functions (Part III) Functions (Part III)Even more examples of function exercises. Introduction of a graph as definition of a function.More free lessons at: http://www.khanacademy.org/video?v=5fcRSie63HsFrom:Khan AcademyViews:252789 575ratingsTime:09:15… - 28 Oct 07, 4:50pm -
Coverting Repeating Decimals to Fractions 1 Coverting Repeating Decimals to Fractions 1Examples of how to convert basic repeating decimals to fractionsMore free lessons at: http://www.khanacademy.org/video?v=FPNhCVZlbJsFrom:Khan AcademyViews:406500 443ratingsTime:04:03More in… - 1 Nov 11, 5:18pm -
Writing Proportions Writing ProportionsSetting up proportions to solve a word problemMore free lessons at: http://www.khanacademy.org/video?v=96ZEmUbnuU8From:Khan AcademyViews:246284 198ratingsTime:05:51More inEducation - 23 Aug 11, 5:23pm -
Alternate Proof to Induction for Integer Sum Alternate Proof to Induction for Integer SumAnother way to prove the expression for the sum of all positive integers up to and including nMore free lessons at: http://www.khanacademy.org/video?v=1wnIsgUivEQFrom:Khan AcademyViews:52176 1… - 9 Aug 11, 7:18pm -
Proof by Induction Proof by InductionProving an expression for the sum of all positive integers up to and including n by inductionMore free lessons at: http://www.khanacademy.org/video?v=wblW_M_HVQ8From:Khan AcademyViews:300484 1112ratingsTime:09:23Mo… - 9 Aug 11, 7:06pm -
New Operator Definitions New Operator DefinitionsGetting comfortable with evaluating newly defined function operatorsMore free lessons at: http://www.khanacademy.org/video?v=ND-Bbp_q46sFrom:Khan AcademyViews:132068 239ratingsTime:06:50More inEducation - 3 Aug 11, 12:03am -
Connection between even and odd numbers and functions Connection between even and odd numbers and functionsA possible reason why even functions are called "even" and odd functions are called "odd"More free lessons at: http://www.khanacademy.org/video?v=jFazrvLodrAFrom:Khan AcademyViews:59430… - 14 Apr 11, 4:09pm -
Recognizing Direct and Inverse Variation Recognizing Direct and Inverse VariationExamples of variables varying directly and inverselyMore free lessons at: http://www.khanacademy.org/video?v=3_DxJwDTbyQFrom:Khan AcademyViews:74957 92ratingsTime:07:05More inEducation - 14 Apr 11, 12:51am -
Direct and Inverse Variation Direct and Inverse VariationUnderstanding direct and inverse variationMore free lessons at: http://www.khanacademy.org/video?v=92U67CUy9GcFrom:Khan AcademyViews:264284 427ratingsTime:09:54More inEducation - 14 Apr 11, 12:25am -
Introduction to Function Inverses Introduction to Function InversesIntroduction to Function InversesMore free lessons at: http://www.khanacademy.org/video?v=W84lObmOp8MFrom:Khan AcademyViews:328284 485ratingsTime:09:06More inEducation - 17 Jul 10, 7:17pm -
Function Inverses Example 3 Function Inverses Example 3Function Inverses Example 3More free lessons at: http://www.khanacademy.org/video?v=Bq9cq9FZuNMFrom:Khan AcademyViews:112650 104ratingsTime:07:35More inEducation - 17 Jul 10, 7:17pm -
Function Inverses Example 2 Function Inverses Example 2Function Inverses Example 2More free lessons at: http://www.khanacademy.org/video?v=aeyFb2eVH1cFrom:Khan AcademyViews:140026 149ratingsTime:07:13More inEducation - 17 Jul 10, 7:17pm -
Function Inverse Example 1 Function Inverse Example 1Function Inverse Example 1More free lessons at: http://www.khanacademy.org/video?v=wSiamij_i_kFrom:Khan AcademyViews:284949 261ratingsTime:06:44More inEducation - 17 Jul 10, 7:17pm -
Geometric series sum to figure out mortgage payments Geometric series sum to figure out mortgage paymentsFiguring out the formula for fixed mortgage payments using the sum of a geometric seriesMore free lessons at: http://www.khanacademy.org/video?v=i05-okb1EJgFrom:Khan AcademyViews:68978… - 30 Mar 10, 4:53pm -
Interesting Polynomial Coefficient Problem Interesting Polynomial Coefficient ProblemFinding the coefficients of a third degree polynomial given 2 roots and the y-interceptMore free lessons at: http://www.khanacademy.org/video?v=hypi8QPsFEkFrom:Khan AcademyViews:85681 97ratings… - 16 Mar 10, 5:01pm -
Passed Bike Word Problem Passed Bike Word ProblemFun algebra word problem involving a train passing a bike.More free lessons at: http://www.khanacademy.org/video?v=P03ljxjy8NwFrom:Khan AcademyViews:35116 67ratingsTime:05:54More inEducation - 22 Aug 09, 7:37pm -
Officer on Horseback Officer on HorsebackNot quite a brain teaser but fun nonetheless!More free lessons at: http://www.khanacademy.org/video?v=IPJAi5zWu9UFrom:Khan AcademyViews:52868 120ratingsTime:08:54More inEducation - 22 Aug 09, 7:37pm -
Overtaking Word Problem Overtaking Word Problem3 people overtaking each other at different ratesMore free lessons at: http://www.khanacademy.org/video?v=LYWUHaWwY0cFrom:Khan AcademyViews:41274 74ratingsTime:09:52More inEducation - 22 Aug 09, 7:37pm -
Early Train Word Problem Early Train Word ProblemFun word problem that is almost a brain teaser.More free lessons at: http://www.khanacademy.org/video?v=uA3m8vbd2wcFrom:Khan AcademyViews:68662 145ratingsTime:07:08More inEducation - 22 Aug 09, 7:37pm -
Two Passing Bicycles Word Problem Two Passing Bicycles Word ProblemAlgebra word problem involving two bicycles passing each other.More free lessons at: http://www.khanacademy.org/video?v=Nx4Xk5S4HQAFrom:Khan AcademyViews:60767 93ratingsTime:05:39More inEducation - 22 Aug 09, 7:37pm -
Focus and Directrix of a Parabola 2 Focus and Directrix of a Parabola 2Finding the focus and directrix of a parabolaMore free lessons at: http://www.khanacademy.org/video?v=1Jm9rREA-uAFrom:Khan AcademyViews:146362 192ratingsTime:18:28More inEducation - 14 Jul 09, 4:46pm -
Parabola Focus and Directrix 1 Parabola Focus and Directrix 1Parabola as the locus of all points equidistant from a point and a lineMore free lessons at: http://www.khanacademy.org/video?v=ZJf9shWlMz0From:Khan AcademyViews:314040 513ratingsTime:14:31More inEduca… - 14 Jul 09, 4:46pm -
Foci of a Hyperbola Foci of a HyperbolaIntroduction to the foci (focuses) of a hyperbolaMore free lessons at: http://www.khanacademy.org/video?v=S0Fd2Tg2v7MFrom:Khan AcademyViews:104753 196ratingsTime:15:24More inEducation - 8 Jul 09, 4:15pm -
Foci of an Ellipse Foci of an EllipseCalculating the foci (or focuses) of an Ellipse.More free lessons at: http://www.khanacademy.org/video?v=QR2vxfwiHAUFrom:Khan AcademyViews:207580 505ratingsTime:13:49More inEducation - 7 Jul 09, 3:54pm -
Conic Sections: Intro to Circles Conic Sections: Intro to CirclesIntroduction to the CircleFrom:Khan AcademyViews:205859 372ratingsTime:09:04More inEducation - 28 Jun 09, 5:36pm -
Introduction to Conic Sections Introduction to Conic SectionsWhat are conic sections and why are they called "conic sections"?More free lessons at: http://www.khanacademy.org/video?v=0A7RR0oy2hoFrom:Khan AcademyViews:365681 703ratingsTime:10:58More inEducation - 15 Jun 09, 7:59pm -
Algebraic Long Division Algebraic Long DivisionDividing one polynomial into anotherFrom:Khan AcademyViews:165363 352ratingsTime:10:22More inEducation - 31 Aug 08, 8:13pm -
Functions (part 4) Functions (part 4)An example of a functions problem submitted by a youtube viewerMore free lessons at: http://www.khanacademy.org/video?v=rbt51hXmzigFrom:Khan AcademyViews:197801 331ratingsTime:06:08More inEducation - 22 Nov 07, 6:14am -
Proof: log a + log b = log ab Proof: log a + log b = log abProof of the logarithm property: log a + log b = log abMore free lessons at: http://www.khanacademy.org/video?v=FP2arCfAfBYFrom:Khan AcademyViews:198200 284ratingsTime:07:09More inEducation - 11 Nov 07, 2:16am -
Proof: A(log B) = log (B^A), log A - log B = log (A/B) Proof: A(log B) = log (B^A), log A - log B = log (A/B)Proofs of the logarithm properties: A(log B) = log (B^A) and log A - log B = log (A/B)More free lessons at: http://www.khanacademy.org/video?v=yEAxG_D1HDwFrom:Khan AcademyViews:110936… - 11 Nov 07, 2:16am -
Functions (Part III) Functions (Part III)Even more examples of function exercises. Introduction of a graph as definition of a function.More free lessons at: http://www.khanacademy.org/video?v=5fcRSie63HsFrom:Khan AcademyViews:252789 575ratingsTime:09:15… - 28 Oct 07, 4:50pm -
Domain of a function Domain of a functionFiguring out the domain of a functionMore free lessons at: http://www.khanacademy.org/video?v=U-k5N1WPk4gFrom:Khan AcademyViews:609696 725ratingsTime:09:59More inEducation - 28 Oct 07, 4:46pm -