Function notation is a shortened method way to write functions.
Let's go over the parts of function notation.
The f is the name of the function. f is usually used but any letter can be used.
The x is the input value.
It is read f of x and not f times x.
When you are asked to evaluate a function you substitute a value for x which is the input in order to find the output.
Evaluate f(x) = 4x + 5 when x is 2
f(2) = 4 ( 2 ) + 5
f(2) = 8 + 5
f(2) = 13
If you evaluate f(x) = 5x + 2r when x = -4r + 3m
You simply plug in the value for x
f(-4r + 3m ) = 5( -4r + 3m ) + 2r
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