Rationalize the Denominator and Simplify $\frac { 21 } { \sqrt { 21 } + 1 }$

question 48

Multiple Choice

Rationalize the denominator and simplify. $\frac { 21 } { \sqrt { 21 } + 1 }$

• A) \(\frac { 21 ( \sqrt { 21 } - 1 ) } { 20 }\)
• B) \(\frac { 21 \sqrt { 21 } - 1 } { 20 }\)
• C) \(\frac { 20 ( \sqrt { 21 } - 1 ) } { 21 }\)
• D) \(\frac { \sqrt { 21 } - 21 } { 20 }\)
• E) \(21 ( \sqrt { 21 } - 1 )\)

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