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) = ?
To solve this, simply plug in (x + 1) in for the function. This is just like Substitution for solving multiple variables.
2(x + 1)
Substitute (x +1) in for x
4 - (x + 1)
2x + 2
3 - x
Manipulating Functions
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