Which of the following graphs represents a function with a domain of (-∞, ∞) and a range of (-∞, ∞)?

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Question

Which of the following graphs represents a function with a domain of (-∞, ∞) and a range of (-∞, ∞)?

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belban · Answer

attachment

helpz-q · Answer

Alright let me take a look...Is this your only question

belban · Answer

yes

welshfella · Answer

that domain means that the value of x is any real number

helpz-q · Answer

Yes that is true...

welshfella · Answer

HinT It can't be D because thaere are no negative values of x  for the graph

welshfella · Answer

the domain of D is {0,∞)

belban · Answer

sorry, I was somewhere else for a moment

belban · Answer

maybe 2?

welshfella · Answer

1 is correct but there are other correct ones too.
The 2 lines in 1 extend to the negative and positive values of x unbounded.
So its domain is (-∞, ∞)      Negative infinity to positive infinity

welshfella · Answer

can you see that applies to No. 2 also?

belban · Answer

Oh, I see, the x value doesn't keep going in number 2

welshfella · Answer

- yes it does - to - infinity and 2 positive infinity

welshfella · Answer

* to positive infinity

belban · Answer

I am a bit confused

welshfella · Answer

- more slowly than the first graph does but it gets there all the same

welshfella · Answer

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