1. Function Notation and Evaluating Functions
Algebra 1 CC
Function Notation and Evaluating Functions

2. You have seen linear functions written in the form y = mx + b
You have seen linear functions written in the form y = mx + b. By naming a function f, you can write it using function notation:
f(x) = mx + b.
f(x) is read “f of x”. You can also think of the notation as the value of the function at x.

3. Example 1 What is the value of the function
f(x) = 0.3x – 1.2 when x = 2?

4. Example 2
What is the value of the function when x = -2?

5. Example 3
Evaluate the function when x = -6, 0, and 4.
g(x) = -5x2 + 9

6. Example 4
For the function h(x) = 5x – 3, find the value of x so that h(x) = 17.

7. Example 5 Find the value of x so that the function has the given value
p(x) = 7.4x – 16; 43.2

8. Example 6
Find the value of x given f(x) = 19
f(x) = 8x – 5