Answer
$$\sqrt{15}\cdot(2+\sqrt{2})=2\sqrt{15}+\sqrt{30}$$
Explanation
| $$ \begin{aligned}\sqrt{15}\cdot(2+\sqrt{2})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2\sqrt{15}+\sqrt{30}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{15} } \cdot \left( 2 + \sqrt{2}\right) = \color{blue}{ \sqrt{15}} \cdot2+\color{blue}{ \sqrt{15}} \cdot \sqrt{2} = \\ = 2 \sqrt{15} + \sqrt{30} $$ |
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