A Question about the Domain and Range of a Function

[student34]

Homework Statement

I constructed my own question to try to make sense of the following notation.

g(x) = 2√x g : X → Y. What does X and Y equal?

Homework Equations

For 2√x, x = or > than 0.

The Attempt at a Solution

g(x) = 2√x g : [0, ∞) → [0, ∞)

So X = Y = [0, ∞)

The reason why I am doing this is because my book shows this: g(x) = 2√x g : [1,∞) → [2,∞). Why does my book have a 1 instead of a 0 as an initial x value?

 

[Dick]

Homework Statement

I constructed my own question to try to make sense of the following notation.

g(x) = 2√x g : X → Y. What does X and Y equal?

Homework Equations

For 2√x, x = or > than 0.

The Attempt at a Solution

g(x) = 2√x g : [0, ∞) → [0, ∞)

So X = Y = [0, ∞)

The reason why I am doing this is because my book shows this: g(x) = 2√x g : [1,∞) → [2,∞). Why does my book have a 1 instead of a 0 as an initial x value?

You have found the LARGEST domain that that function can be defined on. X could always be defined to be a subset of that domain, in which case your job is to figure out the corresponding Y. Are you sure the book didn't tell you X=[1,∞)??

 

[student34]

You have found the LARGEST domain that that function can be defined on. X could always be defined to be a subset of that domain, in which case your job is to figure out the corresponding Y. Are you sure the book didn't tell you X=[1,∞)??

The book just shows this, "g(x) = 2√x g : [1,∞) → [2,∞)" as an example of, "g : B → C". I just used X and Y for this thread.

 

[Dick]

The book just shows this, "g(x) = 2√x g : [1,∞) → [2,∞)" as an example of, "g : B → C". I just used X and Y for this thread.

The book could also have said correctly that "g(x) = 2√x g : [4,∞) → [4,∞)". That would work also, right? Nothing in the problem really fixes what X HAS to be.

 

[student34]

The book could also have said correctly that "g(x) = 2√x g : [4,∞) → [4,∞)". That would work also, right? Nothing in the problem really fixes what X HAS to be.

Oh, I see, thank-you!