Review: Function Notation

Review: Function Notation

review from Algebra 1

Function Notation

"F of x" means the function labeled "f" has an input of "x". It does NOT mean "f times x."

Function notation is just a specific way of writing an equation.

y = 3x + 4 is the SAME as f(x) = 3x + 4

Multiple Choice

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

• Let x = 2

• Let y = 2

Multiple Choice

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

Multiple Choice

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

• (4,2)

• (2, 4)

• That is the only way to write it.

Multiple Choice

If f(x) = -3x - 8, find f(-1).

• f(-1) = 5

• f(-1) = -5

• f(-1) = -12

• f(-1) = -10

Multiple Choice

g(x) = 3x + 1

g(2) = _______

• 6

• 7

• 8

• 9

Multiple Choice

If f(x) = x - 5, what is the value of x when f(x) = 15?

• 20

• 10

• 5

• 0

Multiple Choice

Given f(x) = -4x - 10 and f(x) = 10. Find x

• x = -5

• x = 5

• x = -50

• x = 30

Multiple Choice

If g(x) = 9x and f(x)=3x + 7

Find g(-4) + f(5)

• 14

• -14

• 18

• -58

Function Notation and Graphs

f(x) = y

Multiple Choice

Use the graph find x when f(x) = 1

• -3

• 3

• 3, -3

• 0

Multiple Choice

Use the graph find x when f(x) = 4

• 2

• 4

• 3

• 0

Multiple Choice

Use the graph to evaluate f(2)=

• 2

• -2

• 3

• 0