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: Find a data point (Xi) with the ZScore formula

How To: Estimate probabilities with the empirical rule

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

How To: Find a number given Its percent

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

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

How To: Convert between diameter and radius

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Convert decimals into fractions

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

How To: Find the Percent Given Two Numbers

How To: Solve equations with the order of operations

How To: Calculate percent composition for chemistry

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

How To: Determine the age of a fossil using carbon14

How To: Calculate the area of a parallelogram

How To: Solve for the missing ratios or proportions

How To: Factor a trinomial with negative leading coefficient

How To: Find outliers using the Zscore method

How To: Find a data point (Xi) with the ZScore formula

How To: Estimate probabilities with the empirical rule

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