Question
Answer
$$4\sqrt{2}(\sqrt{3}-5\sqrt{5})=4\sqrt{6}-20\sqrt{10}$$
Explanation
| $$ \begin{aligned}4\sqrt{2}(\sqrt{3}-5\sqrt{5})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\sqrt{6}-20\sqrt{10}\end{aligned} $$ | |
| ① | $$ \color{blue}{ 4 \sqrt{2} } \cdot \left( \sqrt{3}- 5 \sqrt{5}\right) = \color{blue}{ 4 \sqrt{2}} \cdot \sqrt{3}+\color{blue}{ 4 \sqrt{2}} \cdot- 5 \sqrt{5} = \\ = 4 \sqrt{6}- 20 \sqrt{10} $$ |
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