This instructor in this video, Sal Khan,Â in an understandable manner, discusses how to prove a quadratic formula.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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This instructor in this video, Sal Khan,Â explains the quadratic formula.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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The insructorÂ uses y=x^2 to give a sense of why the change in the change of y (or the change in the slope) is constant. This instructor in this video, Sal Khan,Â explains quadratic models.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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This instructor in this video, Sal Khan,Â shows examples of graphingÂ quadratic functions.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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Solving Quadratic Equations by Completing the Square
This instructor in this video, Sal Khan,Â explainsÂ how to solve quadratic equations by completing the square.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen
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Factoring Special Products
This instructor in this video, Sal Khan,Â discusses how to factor special products. Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Basic Calculations in Mathematics : Calculating the Perimeter of a Circle
The perimeter of a circle is calculated by measuring the radius and multiplying it by 2 pi. Calculate the perimeter of a circle with a professional math tutor in this video on math skills. There are English captions at the bottom.

Expert: Fernando Millan
Contact: www.tutormath.info
Bio: Fernando Millan is the owner and founder of Math Specialists LLC and has taught college mathematics courses at Miami Dade Community College, Barry University and University of Florida, am

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Sum of Consecutive Odd Integers (How to Solve)
In this video, Sal Khan demonstrates how to solve for x using a single problem.Â Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education.Â  (04:33) There is a lot of information on the screen--the viewer may want to open the video to 'full screen.'Â
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The instructor in this video, Sal Khan,Â uses a graphing calculator to solve quadratic equations.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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Introduction to Function Inverses
Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (09:05)
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Function Inverse Example 1
Function Inverse Example 1: f(x)= -x+4
This is a continuation of Mr. Khan's Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (06:43)

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Function Inverses Example 2
Function Inverse Example 2: f(x)= (xÂ +Â 2) squared +1
This is aÂ another installmentÂ of Mr. Khan's short 4-part series on FunctionÂ Inverses.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (07:12)

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Function Inverses, Example 3
Function Inverse Example 3: f(x)= (xÂ - 1) squared -2
This isÂ the lastÂ segmentÂ of Mr. Khan's short 4-part series on FunctionÂ Inverses.Â TheseÂ installments started with Khan's Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a l

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This is a short story aboutÂ a young girl with a disability.Â There are no moving images in this video; it just has narration. (02:16) Great for improving listening skills. There are comprehension questions at the end of the story.
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Calculus - Introduction to Limits
In his easy, conversational tone, Mr. Khan offers an introduction to the intuition behind limits.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (07:37)
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Limit Examples (Part 1 of 4)
In this nine-minute video, Mr. Khan offers some limit exercises. Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (07:37)
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Limit Examples (Part 2 of 4)
In this seven-minute video, Mr. Khan offersÂ more limit exercises. Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (06:57)
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Limit Examples (Part 3 of 4)
In this ten-minuteÂ video, Mr. Khan offersÂ even more limit exercises. Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education.
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Limit Examples, Part 4 (with brain malfunction on first problem)
This video offers 3 interesting limit examples (correct answer for problem 1 is 3/16 (6/(4*8) NOT 6/(4+8)). Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (15:02) (Brain malfunction--those are the instructor's words, not the uploader to this site.)
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Squeeze Theorem
Mr. Khan offers this video of the intuition (but not a proof) of the Squeeze Theorem. Mr. Khan uses the Paint Program (with different colors on a black screen)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. (07:37)
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