Evaluating Functions for Values of Domain

What is the domain of the graph?

• [1,∞)

• (-∞,1]

• (-∞,∞)

• [-∞,∞]

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

• Let x = 2

• Let y = 2

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.

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

• f(1) = 1

• f(1) = 4

• f(1) = 0

• f(1) = 3

Evaluate f(-2) if f(x) = x + 3

• -1

• 1

• 5

• -5

Given g(x) =
 4x - 7, find g(-9). 

• g(-9) = 29

• g(-9) = -43

Given g(x) = 4x - 7 and g(x) = 13, find x.

• g(-9) = 29

• x = 5

• g(-9) = -43

• x = 5/4

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

What is the value of f(0)?

• -2

• 2

• 4

• 0

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