2. Function Notation

3. What is function notation?
Function notation is another way to write “y=“
The notation looks like this: f(x)
f(x) is read “f of x”
f(x) = y

4. Solving Problems with Function Notation
f(x) = 2x + 5, find f(5)
f(5) = 2(5) + 5 Plug in 5 in place of x
f(5) = Simplify
f(5) = 15 Simplify
This also means that when x = 5, y = 15
(5,15)

5. This also means that when x = -2, y = 11
Try this problem
f(x) = -3x + 5, find f(-2)
f( -2 ) = -3( -2 ) + 5
f( -2 ) = 6 + 5
f( -2 ) = 11
This also means that when x = -2, y = 11
(-2, 11)

6. Other forms of Function Notation
Function notation is also expressed as:
g(x), h(x), or s(t)
They are all used in place of “y=“ and you may see them in other places!

7. Two Functions at One Time
f(x) = 6x g(x) = 2x – 4
Find the following:
f(4) g(-1)
3. g(3) f(0)
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