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 the quadratic formula on your graphing calculator.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Bisect a line segment

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

How To: Find the Percent Given Two Numbers

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

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

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

How To: Calculate weight if given the mass

How To: Find the Slope Given 2 Ordered Pairs

How To: Identify number types

How To: Solve an equation with fractional powers

How To: Graph the greatest Integer or floor function

How To: Reduce a fraction by finding common factors in math

How To: Calculate Faster Than a Calculator

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

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

How To: Calculate percent composition for chemistry

How To: Find the coordinate of a point

How To: Find the slope from a set of points
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