Need to know how to solve a matrixform linear equation in algebra? 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 finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn a system for solving linear equations in Ax = B form.
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How To: Find a number given Its percent

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How To: Find the coordinate of a point

How To: Simplify surds (improper square roots)

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

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

How To: Convert between diameter and radius

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How To: Find the Radius of a Circle from Arc Length

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