Question
Answer
$$-\sqrt{84}=-2\sqrt{21}$$
Explanation
| $$ \begin{aligned}-\sqrt{84}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2\sqrt{21}\end{aligned} $$ | |
| ① | $$ - \sqrt{84} =
- \sqrt{ 2 ^2 \cdot 21 } =
- \sqrt{ 2 ^2 } \, \sqrt{ 21 } =
- 2 \sqrt{ 21 }$$ |
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