Function Notation

f(x) is the same thing as ______.

• y
• x
• input
• an equation

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

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

If f(x) = 2x+1, what would the function look like once you substitute in a 1 to find f(1)?

• f(x) = 21+1

• f(1) = 2 (1) + 1

• f(1) = 2x (1) + 1

If I know that f(2) = 4, what is another way I can write my answer?

• 2,4

• (2, 4)

• That is the only way to write it.

g(x) = 3x + 1
g(10) = ______

• 14
• 31
• 15
• -31

Find f(2)

• 5

• 4

• 3

• 0

Find f(3)

• 5

• 4

• 3

• 0

Find f(1)

• 1

• 2

• -1

• 3