MIT grad shows you an easy way to use the Quotient Rule to differentiate rational functions. More videos with Nancy coming in 2017!

The Quotient Rule in Calculus tells you how to take the derivative of a rational function. The formal textbook definition of the Quotient Rule is often unnecessarily complex and intimidating.

All you need to remember is "LO dee-HI minus HI dee-LO, over LO LO," where "dee" means the "derivative of." HI means your top function in the numerator, and "LO" means your bottom function in the denominator.

In other words, multiply the bottom function times the derivative of the top function MINUS the top function times the derivative of the bottom function, then DIVIDED by the bottom function times itself. After differentiating with the Quotient Rule, remember to simplify the expression as much as possible using algebra.

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