Algebra II Lesson 2.5

Evaluating Functions

Feb 1

Function Notation

f(x)

We call this "f of x"

f is the function name and x is the input

f(x) is the output

Input: what gets plugged in

Output: the answer for the given input

Multiple Choice

 $f\left(x\right)=x^2-9x+2$  
Evaluate:  $f\left(-2\right)$  

•  $f\left(-2\right)=24$  

•  $f\left(-2\right)=-20$  

•  $f\left(-2\right)=16$  

•  $f\left(-2\right)=-12$  

The function name can change, but your process doesn't

Open Ended

 $g\left(x\right)=-7+9$  

Evaluate: g(5)

Open Ended

 $g\left(x\right)=-7+9$  
evaluate: g(-3)

Open Ended

 $h\left(x\right)=x^2-4x$  
Evaluate: h(-3)

Open Ended

 $h\left(x\right)=x^2-4x$  
evaluate: h(3)

Open Ended

 $h\left(x\right)=x^2-4x$  
evaluate: h(-5)