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What is the domain of f(x)= sqrt x - 7?

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burgerlover | eNotes Newbie

Posted September 4, 2013 at 11:57 PM via web

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What is the domain of f(x)= sqrt x - 7?

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted September 5, 2013 at 12:00 AM (Answer #1)

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Domain of:  `f(x) =sqrt(x) - 7`

We can not have negative values for a radical in a function therefore, our possible inputs for this function has to be anything greater than or equal to zero.

Can not have:  `sqrt(-5)`

Therefore we say that domain is all real numbers greater than or equal to 0.

So:  `{x|x>=0}`

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