Word Problems & Strategy Chapter: Functions & Symbols

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The GMAT uses ƒ(x) to describe a function

A function describes a relationship between one or more inputs and one output.

If ƒ(x) = 2x, then:
ƒ(2) = 4
ƒ(3) = 6

Note: For every ƒ(x) there is one unique value. So, for example, you can't have a ƒ(x) that corresponds to absolute value because ƒ(+2) would result in two answers: -2 and +2.

More interesting functions:

ƒ(x) = 2x/(4 - x)

What does ƒ(x +1) = ?

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Contents of Word Problems Chapter: Table of Contents Chapter 1: Word Problems & Strategies   Chapter 2: 5-Step Method   Chapter 3: Functions & Symbols   Chapter 4: Progressions & Sequences   Chapter 5: Percentages   Chapter 6: Interest, Discount & Markups   Chapter 7: Ratio & Proportion   Chapter 8: Uniform Motion   Chapter 9: Work & Rate   Chapter 10: Grouping & Counting   Chapter 11: Data Interpretation   Chapter 12: Averages & Mean   Progressions & Sequences

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