Domain and Range of √(x−1)

Find the Domain and Range of the Function

Question:

The domain and range of the real function

\[ f(x)=\sqrt{x-1} \]

are given by

(a) Domain \(=(1,\infty)\), Range \(=(0,\infty)\)
(b) Domain \(=[1,\infty)\), Range \(=(0,\infty)\)
(c) Domain \(=[1,\infty)\), Range \(=[0,\infty)\)
(d) Domain \(=[1,\infty)\), Range \(=[0,\infty)\)

Solution:

For square root function,

\[ x-1\ge0 \]

\[ x\ge1 \]

Therefore, domain is

\[ [1,\infty) \]

Also,

\[ \sqrt{x-1}\ge0 \]

Minimum value is \(0\) at \(x=1\).

Hence, range is

\[ [0,\infty) \]

Therefore,

\[ \boxed{\text{Correct Answer: (c)}} \]

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