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GMAT Prep - Math - Algebra - Composite Functions by Knewton

Go to http://www.knewton.com/gmat/ for hundreds of GMAT math and verbal concepts, thousands of practice problems and much more. Knewton GMAT is a GMAT prep course that redefines everything you thought you knew about online learning. Functions can often be nested inside of other functions. These are called composite functions. Let's take a look at what that means with the following two functions: f(x) = 3x -- 20 r(t) = √t We might be asked to solve something like this: r(f(12)). We'll put 12 into function f, which will give us 3(12) -- 20 = 36 -- 20 = 16. Then we plug in 16 into function r. √16 = 4. Remember that r(f(12)) does not equal f(r(12)). Subscribe to this channel for tips, explanations, and Q&A about the GMAT and getting your MBA.
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