Nitayah says that the inverse of y=3±√ (x+2) cannot be a function because y=3±√ (x+2) is not a function. Is she right? Explain.

A function is a special relationship where each input has a single output.

It is often written as "f (x) " where x is the input value.

Example: f (x) = x/2 ("f of x equals x divided by 2")

It is a function because each input "x" has a single output "x/2":

• f (2) = 1

• f (16) = 8

• f (-10) = - 5

So I guess she is right!

Nitayah is right. A function has 1 input for every output.