Finding Function Values

Does the mapping of these points represent a function? (Note: the left oval represents your x values and the right oval represents your y values)

• Function

• Not a Function

Which is a function?

• A

• B

• C

• D

Does this mapping diagram represent a function?

• No, because an input value goes to multiple output values

• Yes, because each input goes to one and only one output

Find y when x = 0.

• 3

• 0

• 7

• -2

Find all values of x where y=0.

• 4

• 8

• 0 and 8

• 4 and 8

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

• Function 
• Not a Function

Which graph is a function?

• Graph 1

• Graph 2

• Graph 3

• Graph 4

Given f(x) = 2x and g(x) = x²+3 , find f(g(x)).

• x²+2x+3

• 4x²+3

• 2x²+3

• 2x²+6

Are these inverse functions?

• yes

• no

• no way to tell