Functions Review

What is the definition of function?

• Has inputs and outputs

• Every input has only ONE output

• Inputs have different outputs every time

• x-values and y-values

Which set of values is a function?

• (9,5) (10,5) (9,-5) (10,-5)
• (3,4) (4,-3) (7,4) (3, 8)
• (6,-5) (7, -3) (8, -1) (9, 1)
• (2, -2) (5, 9) (5, -7) (1, 4)

Evaluate f(-4) for the function f(x)=3x²-5

• f(-4) = 43
• f(-4) = 139
• f(-4) = -52
• f(-4) = -149

• Function

• Not a Function

Is this mapping a function?

• Function

• Not a Function

How is f(x) read?

• function notation

• f times x

• f of x

• replaces y

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

• Let x = 2

• Let y = 2

What is f(0) in this function?

• -1

• 2

• 4

• -5

All of the y-values or outputs are called what?

• Domain

• Function

• Relation

• Range

What is the y-intercept of the line graphed below?

• 3
• 4
• -3
• 4/3