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

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

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

How To: Prove a triangle inscribed in a circle is right angled

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

How To: Solve percentages without a calculator

How To: Multiply Any Number by 11 with a Super Fast Mental Trick

How To: Calculate Faster Than a Calculator

How To: Calculate the area of a parallelogram

How To: Find the area of a parallelogram using geometry

How To: Rotate a shape about the origin 90° counterclockwise

How To: Calculate weight if given the mass

How To: Determine the age of a fossil using carbon14

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

How To: Divide small numbers by big numbers

How To: Solve for the missing ratios or proportions

How To: Translate a shape

How To: Factor a trinomial with negative leading coefficient

How To: Do long division with decimals
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