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 a slope of a straight line with: Ax + By + C = 0

How To: Find the Percent Given Two Numbers

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

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

How To: Find a number given Its percent

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

How To: Do long division without a calculator

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

How To: Find the formula of a piecewise function given a graph

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Calculate Faster Than a Calculator

How To: Learn Calculus in 20 minutes

How To: Find density using the water displacement method

How To: Calculate the area of a parallelogram

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

How To: Isolate a variable

How To: Solve percentages without a calculator

How To: Simplify fourth roots

How To: Find outliers using the Zscore method

How To: Do normal probability calculations on a calculator

How To: Find a slope of a straight line with: Ax + By + C = 0
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