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 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 work with radical equations containing invalid or "extraneous" solutions.
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How To: Evaluate fractions containing variables

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Evaluate combinations of functions from graphs

How To: Use a TI89 calculator to graph linear equations

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

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

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

How To: Solve equations with the order of operations

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

How To: Find the standard deviation with the ZScore formula

How To: Multiply fractions, polynomials, signed numbers, exponents, and square roots

How To: Solve circlebased problems in basic geometry

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Calculate the area of a parallelogram

How To: Solve problems involving functions in algebra
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