Function Notation

What is the value of x in:
f(3) = 2x + 1

• 3

• 2

• 1

• 0

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

• Let x = 2

• Let y = 2

You can eat 6 animal crackers per minute.  There are 200 animal crackers in the jar when you started eating. Write a function to represent the number of animal crackers left in the jar after x minutes.

• f(x) = −6x + 200

• f(x) = 6x + 200

• f(x) = 200x + 6

• f(x) = −200x + 6

The function h(t) represents the height in inches of a plant after t weeks. What does the notation h(4) = 5 mean?

• After 5 week the plant is 4 inches tall

• The plant grows at a rate of 5/4 inch per week

• After 4 weeks the plant is 5 inches tall

• The plant grows at a rate of 1 inch per week

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

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

If f(x) = 2x + 1, find f(1).

• f(1) = 1

• f(1) = 4

• f(1) = 0

• f(1) = 3

What is f(1)?

• 1

• 5

• 0

• 4

What is f(8)? 

• 8

• 0

• 3

• -2

What is x if
f(x) = -2?

• 4

• 0

• 3

• 8