Question
Answer
$$\sqrt{10}\cdot(2\sqrt{2}+5)=4\sqrt{5}+5\sqrt{10}$$
Explanation
| $$ \begin{aligned}\sqrt{10}\cdot(2\sqrt{2}+5)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\sqrt{5}+5\sqrt{10}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{10} } \cdot \left( 2 \sqrt{2} + 5\right) = \color{blue}{ \sqrt{10}} \cdot 2 \sqrt{2}+\color{blue}{ \sqrt{10}} \cdot5 = \\ = 4 \sqrt{5} + 5 \sqrt{10} $$ |
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