Understanding Function Notation

What is the independent variable in the equation y = 2x - 5?

• y

• 2

• x

• -5

In function notation, what does f(x) represent?

• The value of x

• The value of f at x

• The value of y

• The value of x at f

How do you read the notation f(4) in function notation?

• f times 4

• f divided by 4

• f plus 4

• f of 4

If f(x) = 2x - 5, what is f(0)?

• -5

• 2

• 0

• 5

What is the result of G(0) if G(x) = x^2 + 2x - 1?

• 0

• -1

• 2

• 1

How do you evaluate G(a) if G(x) = x^2 + 2x - 1?

• Replace x with a

• Replace x with 0

• Replace x with 1

• Replace x with -1

If G(x) = x^2 + 2x - 1, what is G(-1)?

• -2

• 0

• 1

• -1

What happens when you evaluate a function with an expression like x + 3?

• You get a number

• You get a new expression

• You get zero

• You get an error

What is the purpose of using function notation instead of y?

• To confuse students

• To avoid using numbers

• To confirm the existence of a function

• To make equations longer

What does function notation guarantee about the relationship between x and y?

• Each x gives exactly one y

• y is always greater than x

• x is always greater than y

• x and y are equal