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 how to solve quadratic equations by completing the square in intermediate algebra.
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How To: Remember "greater than" & "less than" symbols

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How To: Find the volume of a cone quickly

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the 100th term in a sequence

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Solve for the missing ratios or proportions

How To: Find the coordinate of a point

How To: Evaluate square roots

How To: Solve an equation with fractional powers

How To: Use a mean and scatter plot for Statistics

How To: Solve advanced ratio problems in algebra

How To: Do long division quickly

How To: Do long division without a calculator

How To: Convert between diameter and radius

How To: Calculate the area of a parallelogram

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

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

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

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

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

How To: Find the volume of a cone quickly

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the 100th term in a sequence

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Solve for the missing ratios or proportions

How To: Find the coordinate of a point

How To: Evaluate square roots

How To: Solve an equation with fractional powers

How To: Use a mean and scatter plot for Statistics

How To: Solve advanced ratio problems in algebra

How To: Do long division quickly

How To: Do long division without a calculator

How To: Convert between diameter and radius

How To: Calculate the area of a parallelogram

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

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