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

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How To: Find the 100th term in a sequence

How To: Evaluate successive percentage changes

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

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Identify characteristics of a sample during a survey

How To: Find extra points for a parabola (quadractic equation)

How To: Write a sum/difference of logarithms as a logarithm

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

How To: Find the slope from a set of points

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

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