Question
Answer
$$-10\sqrt{3}(-2\sqrt{21})=60\sqrt{7}$$
Explanation
| $$ \begin{aligned}-10\sqrt{3}(-2\sqrt{21})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}60\sqrt{7}\end{aligned} $$ | |
| ① | $$ 20 \sqrt{63} =
20 \sqrt{ 3 ^2 \cdot 7 } =
20 \sqrt{ 3 ^2 } \, \sqrt{ 7 } =
20 \cdot 3 \sqrt{ 7 } =
60 \sqrt{ 7 } $$ |
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