Rationalize the denominator of 2121.

2121 = 2121 2121 = 212121 = !21.

jmc

algebra junior

Problem

Rationalize the denominator of

\frac{21}{21}

Solution

\frac{21}{21} = \frac{21}{21} \cdot \frac{21}{21} = \frac{21 21}{21} = 21

Final answer

\!\sqrt{21}