Functions Practice 2

How do you read f(x)?

• f x

• f of x

• f parenthesis x

• f with an x inside parenthesis

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

Is this table a function or not a function? 

• Function
• Not a Function

Is this a function? Explain.

• Yes; the line segments are straight.

• No; it is not a straight line.
• Yes; each input, x, goes with only one output, y.

• No; there is a line connecting the dots.

Is this a function or not?

• Function

• Not a Function

Decide which function value is greater, if they are equal, or if we can't tell. $f\left(0\right)\ or\ f\left(4\right)$  

•  $f\left(0\right)$  

•  $f\left(4\right)$  

• Equal 

• We can't tell

Decide which function value is greater, if they are equal, or if we can't tell. $f\left(2\right)\ or\ f\left(5\right)$  

•  $f\left(2\right)$  

•  $f\left(5\right)$  

• Equal

• We can't tell

f(x) is the same thing as ______.

• y
• x
• input
• an equation

What is the definition of a function?

• Has inputs and outputs

• Every input has only ONE output

• Inputs have different outputs every time

• x-values and y-values

Is the relation a function? Why?

• Yes, because the x-value 11 has two y-values paired with it.

• Yes, because each x-value has only one y-value paired with it.
• No, because the x-value 11 has two y-values paired with it.

• No, because each x-value has only one y-value paired with it.