Function Notation and Evaluating Functions

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

How do you read f(x)?

• f x

• f of x

• f parenthesis x

• f with an x inside parenthesis

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

• Let x = 2

• Let y = 2

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Only plug a 1 into the right side

f(x)=4x+5
f(4)=

• 21
• -11
• -31
• 25

If f(x) = 2x² + 5x - 3, evaluate f(-1).

• f(-1) = -6

• f(-1) = 1

• f(-1) = -10

• f(-1) = -1

Evaluate f(-2) if f(x) = x²+ 3

• -1

• 1

• 7

• -7

If h(x) = -5x + 7,

Evaluate h(2).

• -2

• 3

• -18

• -3

Given h(x) = 5 - 9x, find h(8). 

• h(8) = -360
• h(8) = -67

Given f(x) = 2x² + 5x - 17, find f(-1). 

• f(-1) = -20
• f(-1) = -24