Classify the Function as a Polynomial Function, Rational Function, or Root

question 144

Multiple Choice

Classify the function as a polynomial function, rational function, or root function, and then find the domain. Write the domain in interval notation.
- $$f ( x ) = \sqrt { 21 - x }$$

• A) root function; \(( \infty , \sqrt { 21 } ]\)
• B) root function; \(( - \infty , \sqrt { 21 } ) \cup ( \sqrt { 21 } , \infty )\)
• C) root function; \(( \infty , 21 ]\)
• D) root function; \(( - \infty , 21 ) \cup ( 21 , \infty )\)

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