**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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