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: Find the formula of a piecewise function given a graph

How To: Find the equation of a circle given: center & tangent

How To: Find the slope of a line given 2 points with fractions

How To: Find the 100th term in a sequence

How To: Prove cos(a+b)=(cos a)(cos b)(sin a)(sin b) in trig

How To: Find the equation of a line given 2 points

How To: Find the common ratio of a geometric series

How To: Apply exponent rules in basic algebra

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Convert between diameter and radius

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

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

How To: Find the equation of a line given 1 point

How To: Learn Calculus in 20 minutes

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

How To: Evaluate square roots
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