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The natural domain of the real function f defined by f(x) = √x - 1 is

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The natural domain of the real function f defined by f(x) = √x - 1 is 

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Correct option: (c)

Explanation:  

For the function to be defined the value inside the root must be non-negative. That is, x - 1 ≥ 0 implies the domain is [1, ∞).

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