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 Percent Given Two Numbers

How To: Find the area of a parallelogram using geometry

How To: Do long division without a calculator

How To: Find a number given Its percent

How To: Convert between diameter and radius

How To: Find the 100th term in a sequence

How To: Calculate Faster Than a Calculator

How To: Find the area of a triangle when given 2 sides & angle

How To: Translate a shape

How To: Isolate a variable

How To: Find the standard deviation with the ZScore formula

How To: Graph x & y intercepts on a TI84 Plus calculator

How To: Express a fraction in lowest terms in basic math

How To: Evaluate numbers raised to fractional exponents

How To: Divide small numbers by big numbers

How To: Calculate percent composition for chemistry

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

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle
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