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The functions are $\"\"$ , $\"\"$ and $\"\"$ .

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The domain of $\"\"$ is all real numbers.

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The domain of $\"\"$ is all real numbers.

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The domain of $\"\"$ is is all real numbers.

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Find $\"\"$ .

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$\"\"$

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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Substitute $\"\"$ for $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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To find $\"\"$ , you must first be able to find $\"\"$ , for each of these $\"\"$ values, which can only be done for $\"\"$ .

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This means that we must exclude from the domain in those values for which $\"\"$ .

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$\"\"$

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Add $\"\"$ to each side.

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$\"\"$

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$\"\"$ Take square root each side.

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$\"\"$

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$\"\"$

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Therefore, the domain of $\"\"$ is $\"\"$ .

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Find $\"\"$ .

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$\"\"$ .

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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Substitute $\"\"$ for $\"\"$ in $\"\"$ .

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$\"\"$

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Therefore, $\"\"$ for $\"\"$ .

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$\"\"$ for $\"\"$ .