For the function g(x) = √(x − 4), what is the domain?

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Question

For the function g(x) = √(x − 4), what is the domain?

Accepted Answer

x ≥ 4 — Award 1 mark for x ≥ 4. The expression under the square root must be non-negative: x − 4 ≥ 0, so x ≥ 4. A is incorrect — this ignores the −4 inside the root. C is incorrect — x = 4 gives √0 = 0 which is valid. D is incorrect — negative values under the square root are not real.

Answer

All real numbers

Answer

x ≥ 4

Answer

x ≥ 0

Answer

x > 4

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