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

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

How To: Calculate percent composition for chemistry

How To: Find the area of a parallelogram using geometry

How To: Solve word problems involving domain and range

How To: Find the standard deviation with the ZScore formula

How To: Convert improper fractions to mixed numbers quickly

How To: Use a mean and scatter plot for Statistics

How To: Find the perimeter & area of a complex figure

How To: Find the area of a rhombus

How To: Find a number given Its percent

How To: Write a slopeintercept equation given an XY table

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Factor a trinomial with negative leading coefficient

How To: Square expressions involving radicals

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Solve an equation for a specified variable

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

How To: Do long division without a calculator

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

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

How To: Calculate percent composition for chemistry

How To: Find the area of a parallelogram using geometry

How To: Solve word problems involving domain and range

How To: Find the standard deviation with the ZScore formula

How To: Convert improper fractions to mixed numbers quickly

How To: Use a mean and scatter plot for Statistics

How To: Find the perimeter & area of a complex figure

How To: Find the area of a rhombus

How To: Find a number given Its percent

How To: Write a slopeintercept equation given an XY table

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Factor a trinomial with negative leading coefficient

How To: Square expressions involving radicals

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Solve an equation for a specified variable
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