Answer
$$\frac{2\sqrt{21}}{2}=\sqrt{21}$$
Explanation
| $$ \begin{aligned}\frac{2\sqrt{21}}{2}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{\sqrt{21}}{1} \xlongequal{ } \\[1 em] & \xlongequal{ }\sqrt{21}\end{aligned} $$ | |
| ① | Divide both numerator and denominator by 2. |
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