Evaluating Functions Given a Domain

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

• x = -5

• x = 5

• x = -50

• x = 30

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

What is the domain?

• None of the answer choices

The set of all x-values used to graph a function are called the ____.

• Domain

• Range

• Relation

• Function

What is the domain of the graph?

• [1,∞)

• (-∞,1]

• (-∞,∞)

• [-∞,∞]