Function Notation

f(x) is the same thing as _________.

• y

• x

• input

• an equation

How do you read f(x)?

• f x

• f parenthesis x

• f of x

• f with an x inside parenthesis

Tags

CCSS.HSF.IF.A.1

CCSS.HSF.IF.A.2

If a question asks you to find f(2), what does that mean?

• Let x = 2

• Let y = 2

How would you write y = 2x - 3 in function notation?

• y = 2x - 3

• f = 2x - 3

• f(x) = 2x - 3

If $f\left(x\right)=3x^2-4x+5,\$  what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Only plug a 1 into the left side

• Set the function equal to 1

If $f\left(x\right)=3x^2-4x+5,\$  what would the function look like once you substitute in a 1 to find f(1)?

•  $f\left(x\right)=31^2-41+5$  
  

•  $f\left(1\right)=3x^2\left(1\right)-4x\left(1\right)+5$  
  

•  $f\left(1\right)=3\left(1\right)^2-4\left(1\right)+5$  
  

 Find f(0) when, $f\left(x\right)=x^2-4x-4.$ 

• f(0) = 16

• f(0) = -8

• f(0) = -4

• f(0) = 4

For the function,   $f\left(x\right)=-3\left(x-1\right)$  find f(0).

• 0

• 3

• -3

• -1

 $Evaluate\ f(-2)\ \ if\ f(x)=x+3$  

• -1

• 5

• 1

• -5

 $If\ f\left(x\right)=x-5,\$  

what is the value of x when f(x) = 15?

• x = 20

• x = 5

• x = 10

• x = 0