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: Find the Percent Given Two Numbers

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

How To: Solve equations with fractions and decimals

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

How To: Solve for the missing ratios or proportions

How To: Understand the differences / similarities between squares, rectangles & rhombi

How To: Evaluate functions by substituting in the variable to the input given

How To: Understand basic probability with examples

How To: Calculate Faster Than a Calculator

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Calculate the area of a parallelogram

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

How To: Determine the age of a fossil using carbon14

How To: Multiply proper & improper fractions

How To: Find the formula of a given sequence

How To: Find the area of an oblique triangle using formulas

How To: Derive the area of a circle

How To: Find how many toothpicks will be needed to form the nth figure in a sequence
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