Evaluate Functions Input Output

If f(x) = 2x+1, what would the function look like once you substitute in a 1 to find f(1)?

• f(x) = 21+1

• f(1) = 2 (1) + 1

• f(1) = 2x (1) + 1

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

• Let x = 2

• Let y = 2

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

What is f(6) for the function f(x)=3x-8

• -8

• 10

• -144

• answer not here

$f\left(x\right)=5x-12$ What is $f\left(-4\right)$

• -32

• -3

• -12

• 3

What is f(2)?

• -4

• 8

• 0

• 5

For what value of x does f(x) = -2?

• 0

• -5

• 3

• -3

What is f(5) for the function f?

f(x) = 2(x - 7)

• 3

• -4

• -3

• 1

Is this a function? 

• Yes, because every input has exactly one output

• No, because -1 has more than one output 

• No, because 3 is in the input and the output 

What is a rule that assigns exactly one output to ever input? 

• mapping diagram

• table 

• function

• function notation