From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to write a formal analytical proof of the quadratic formula.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Do long division without a calculator

How To: Remember "greater than" & "less than" symbols

How To: Divide small numbers by big numbers

How To: Understand the differences / similarities between squares, rectangles & rhombi

How To: Convert Fahrenheit to Celsius with a formula

How To: Convert between diameter and radius

How To: Translate a sentence into math symbols

How To: Find the opposite and absolute value of a number

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Find the equation of a circle given: center & tangent

How To: Find the area & perimeter of triangles & squares

How To: Identify characteristics of a sample during a survey

How To: Factor quadratic expressions using trial and error

How To: Multiply proper & improper fractions

How To: Square expressions involving radicals

How To: Write a slopeintercept equation given an XY table

How To: Convert Fahrenheit to Celsius for chemistry

How To: Do long division with decimals
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