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What about this box?

domain guys  ->  rule: (square root of the input) + 4  ->  range guys
 

The official notation would be

f( x ) = (square root of x) + 4  ...  x guys go in  ... and spits "(square root of x) + 4" out

 

So,
 
f( 9 ) = (square root of 9) + 4 = 3 + 4 = 7
  like letting x = 9


YOUR TURN:

Find the official notation for this box, then use the notation to find

f( 0 )

f( 6 )

f( -3 )
 

                    domain guys  ->  rule: 5 - ( input )^2  ->  range guys