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

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the slope of a line given 2 points with fractions

How To: Calculate percent composition for chemistry

How To: Find the Percent Given Two Numbers

How To: Divide small numbers by big numbers

How To: Evaluate square roots

How To: Find the area of a parallelogram using geometry

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Write a slopeintercept equation given an XY table

How To: Use derivatives to find slope in calculus

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Find the Radius of a Circle from Arc Length

How To: Cancel out in basic algebra

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

How To: Figure out the domain & range of a piecewise function

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How To: Solve word problems involving domain and range

How To: Do long division with decimals
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