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 solve quadratic equations by applying the quadratic formula.
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How To: Find the area of a parallelogram using geometry

How To: Isolate a variable

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

How To: Find the area of a circle when you know the diameter

How To: Convert fractions to percents in two steps

How To: Divide decimals

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

How To: Find a missing side of a triangle, similar to another

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

How To: Draw a right trapezoid in Geometry

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

How To: Subtract a mixed number from a proper fraction in basic math

How To: Simplify square roots in less than a minute

How To: Use the Pythagorean Formula to find a missing side

How To: Find indefinite integrals or antiderivatives in calc

How To: Find the surface area of a sphere

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

How To: Find a number given Its percent

How To: Do long division without a calculator

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