1. Function Notation
“f of x”
Input = x
Output = f(x) = y

2. (x, y) (x, f(x)) (input, output) y = – 3x+6 f(x) = – 3x+6 x y x f(x)
Before…
Now…
y = – 3x+6
f(x) = – 3x+6 x y x
f(x) -2 -1 1 2 12 -2 -1 1 2 12
(x, y)
(x, f(x)) 9 9 6 6 3 3
(input, output)

3. g(2) = 2 3 g(5) = Find g(2) and g(5).
Example
Find g(2) and g(5).
g = {(1, 4),(2,3),(3,2),(4,-8),(5,2)}
g(2) = 2 3
g(5) =

4. Consider the function h= { (-4, 0), (9,1), (-3, -2), (6,6), (0, -2)}
Example
Consider the function h= { (-4, 0), (9,1), (-3, -2), (6,6), (0, -2)}
Find h(9), h(6), and h(0).

5. Example.
f(x) = 2x2 – 3
Find f(0), f(-3).

6. Example.
f(x) = 3x2 +1
Find f(0), f(-1).

7. What are your questions?