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What's a Function (Intro to Domain and Range)

One last box:

THE RULE:  Triple the input, then subtract 5

input: -2 -> rule: 3( ) - 5 -> -11 ... input: 40 -> rule: 3( ) - 5 -> 115
 

What's the domain and range for this function?

                                  domain  =  all real numbers

=

( -infinity , infinity )

interval notation

range  =   ( -infinity , infinity )

 

TRY IT:

What's the domain and range for this function?

THE RULE:  Take the square root, then add 4

input -> rule: square root of the input + 4 -> output
 

*We're only dealing with real numbers -- no imaginary guys!