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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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