Question
Answer
$$\sqrt{7}\cdot(\sqrt{3}+7)=\sqrt{21}+7\sqrt{7}$$
Explanation
| $$ \begin{aligned}\sqrt{7}\cdot(\sqrt{3}+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\sqrt{21}+7\sqrt{7}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{7} } \cdot \left( \sqrt{3} + 7\right) = \color{blue}{ \sqrt{7}} \cdot \sqrt{3}+\color{blue}{ \sqrt{7}} \cdot7 = \\ = \sqrt{21} + 7 \sqrt{7} $$ |
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