Question
Answer
$$\sqrt{7}\cdot(4+7\sqrt{11})=4\sqrt{7}+7\sqrt{77}$$
Explanation
| $$ \begin{aligned}\sqrt{7}\cdot(4+7\sqrt{11})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\sqrt{7}+7\sqrt{77}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{7} } \cdot \left( 4 + 7 \sqrt{11}\right) = \color{blue}{ \sqrt{7}} \cdot4+\color{blue}{ \sqrt{7}} \cdot 7 \sqrt{11} = \\ = 4 \sqrt{7} + 7 \sqrt{77} $$ |
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