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

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

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

How To: Find the domain of a function in precalculus

How To: Calculate percent composition for chemistry

How To: Calculate Faster Than a Calculator

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

How To: Calculate the area of a parallelogram

How To: Solve inductive reasoning problems in math

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

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

How To: Solve percentages without a calculator

How To: Find the area of a circle when you know the diameter

How To: Find the x & y intercepts of rational functions

How To: Solve problems involving deductive reasoning

How To: Find the value of a variable in an algebraic equation

How To: Derive the area of a circle

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