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

How To: Calculate Faster Than a Calculator

How To: Find the area & perimeter of triangles & squares

How To: Do long division without a calculator

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

How To: Divide small numbers by big numbers

How To: Find and sketch the domain of a multivariable function

How To: Find the volume of a sphere with radius r

How To: Sketch the graph of a piecewise function

How To: Divide exponents with the quotient rule

How To: Find the Percent Given Two Numbers

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

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

How To: Find extra points for a parabola (quadractic equation)

How To: Solve for the missing ratios or proportions

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

How To: Do long division with decimals

How To: Find the area of irregular shapes

How To: Solve equations involving square roots

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

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

How To: Calculate Faster Than a Calculator

How To: Find the area & perimeter of triangles & squares

How To: Do long division without a calculator

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

How To: Divide small numbers by big numbers

How To: Find and sketch the domain of a multivariable function

How To: Find the volume of a sphere with radius r

How To: Sketch the graph of a piecewise function

How To: Divide exponents with the quotient rule

How To: Find the Percent Given Two Numbers

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

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

How To: Find extra points for a parabola (quadractic equation)

How To: Solve for the missing ratios or proportions

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

How To: Do long division with decimals

How To: Find the area of irregular shapes

How To: Solve equations involving square roots
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