1. Coordinate Algebra Day 44
Agenda:
Warm – Ups
Notes on Function Notation and Evaluating Functions
Learning Target:
Students can evaluate functions in function notation.

2. Function Notation

3. Function form of an equation
A way to name a function
f(x) is a fancy way of writing “y” in an equation.
Pronounced “f of x”

4. Evaluating Functions

5. Tell me what you get when x is -2.
1. Evaluating a function
Tell me what you get when x is -2.
f(x) = 2x – 3 when x = -2
f(-2) = 2(-2) – 3
f(-2) = - 4 – 3
f(-2) = - 7

6. Tell me what you get when x is 3.
2. Evaluating a function
Tell me what you get when x is 3.
f(x) = 32(2)x when x = 3
f(3) = 32(2)3
f(3) = 256

7. Tell me what you get when x is -3.
3. Evaluating a function
Tell me what you get when x is -3.
f(x) = x2 – 2x + 3 find f(-3)
f(-3) = (-3)2 – 2(-3) + 3
f(-3) =
f(-3) = 18

8. Tell me what you get when x is 3.
4. Evaluating a function
Tell me what you get when x is 3.
f(x) = 3x + 1 find f(3)
f(3) =
f(3) = 28

9. Find f(6).
Find g(-1).
Given r(x) = 2x – 1, evaluate the domain {0, 1, 2, 3}. What is the range of r(x)? 4 3
Range: {-1, 1, 3, 5}

10. Homework/Classwork Review your answers from the Function Practice
Worksheet and make any needed corrections.