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 unpack and solve word problems that require you to apply quadratic functions in algebra.
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How To: Apply the fundamental rule of proportions

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

How To: Find a number given Its percent

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: Subtract a mixed number from a proper fraction in basic math

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

How To: Derive the basic area of a triangle

How To: Solve equations involving square roots

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Divide small numbers by big numbers

How To: Solve problems involving functions in algebra

How To: Identify characteristics of a sample during a survey

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

How To: Solve equations with the order of operations

How To: Find the area of irregular shapes

How To: Find the volume of a swimming pool

How To: Find the percentage of a number easily

How To: Apply the fundamental rule of proportions

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

How To: Find a number given Its percent

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: Subtract a mixed number from a proper fraction in basic math

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

How To: Derive the basic area of a triangle

How To: Solve equations involving square roots

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Divide small numbers by big numbers

How To: Solve problems involving functions in algebra

How To: Identify characteristics of a sample during a survey

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

How To: Solve equations with the order of operations

How To: Find the area of irregular shapes

How To: Find the volume of a swimming pool

How To: Find the percentage of a number easily
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