TAILIEUCHUNG - Wiley publishing inc GMT for dummies Episode 1 part 8

Tham khảo tài liệu 'wiley publishing inc gmt for dummies episode 1 part 8', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 158 Part IV Conquering the Quantitative Section Minding Your Ps and Qs Functions Some of the GMAT math questions involve functions. Simply put functions are relationships between two sets of numbers each number you put into the formula will give you only one possible answer. Functions may sound complicated but they re really pretty simple. A function problem looks something like this f x 2x 3. What is f 2 But before we show you how to solve function problems you should know a few definitions. Table 11-3 gives you the terms we ll use when we discuss functions. Table 11-3 Defining Terms for Functions Term Definition Function A rule that turns each member of one set of numbers into a member of another set. Independent variable input The number you want to find the function of the x in f x . Dependent variable output The result of substituting the independent value into the function f x . This is like your yvariable. Domain The set of all possible values of the independent variable. Range The set of all possible values of the dependent variable. Standing in Understanding the symbols used for functions Functions can be displayed in any number of ways on the GMAT. Most of the time you ll see characters like the letters f F g G and n. For example f x is used to indicate the function of x and it simply means f of x. F g and n are the most commonly used function symbols but any type of letter or symbol can represent a function. So you could see symbols like these used to signify functions x x x and other even stranger ones like other letters from the Greek alphabet. Don t let these unusual symbols confuse you. The GMAT uses these red herrings to throw you off balance. Regardless of what symbol appears all you really have to do is substitute for x in the value indicated in the function. Don t think that the parentheses in the function notation mean multiplication like they do in algebraic operations. The expression f x doesn t mean f X x. To see how functions work consider .

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