Question
Answer
$$2\sqrt{4}\sqrt{5}=4\sqrt{5}$$
Explanation
| $$ \begin{aligned}2\sqrt{4}\sqrt{5}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\sqrt{5}\end{aligned} $$ | |
| ① | $$ 2 \sqrt{20} =
2 \sqrt{ 2 ^2 \cdot 5 } =
2 \sqrt{ 2 ^2 } \, \sqrt{ 5 } =
2 \cdot 2 \sqrt{ 5 } =
4 \sqrt{ 5 } $$ |
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