Function notation is a special way to write functions that explicitly shows that y
is a function of x.
In other words, that y
depends on x.
Function notation is symbolically expressed as
f of x equals y.
Remember that x
represents the of the function and y
represents the . Written in function notation, the function y=5x−7
Letters other than f
can be used to name a function. Additionally, function notation can be adjusted when the variable used to represent the input is not x.
For example, a function describing how the value, V,
of a car changes over time, t,
can be expressed as