Question
Answer
$$\sqrt{11}\cdot(-4+10\sqrt{5})=-4\sqrt{11}+10\sqrt{55}$$
Explanation
| $$ \begin{aligned}\sqrt{11}\cdot(-4+10\sqrt{5})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4\sqrt{11}+10\sqrt{55}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{11} } \cdot \left( -4 + 10 \sqrt{5}\right) = \color{blue}{ \sqrt{11}} \cdot-4+\color{blue}{ \sqrt{11}} \cdot 10 \sqrt{5} = \\ = - 4 \sqrt{11} + 10 \sqrt{55} $$ |
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