Question
Answer
$$3\sqrt{5}\cdot3\sqrt{8}=18\sqrt{10}$$
Explanation
| $$ \begin{aligned}3\sqrt{5}\cdot3\sqrt{8}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}18\sqrt{10}\end{aligned} $$ | |
| ① | $$ 9 \sqrt{40} =
9 \sqrt{ 2 ^2 \cdot 10 } =
9 \sqrt{ 2 ^2 } \, \sqrt{ 10 } =
9 \cdot 2 \sqrt{ 10 } =
18 \sqrt{ 10 } $$ |
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