Question
Answer
$$7\sqrt{5}\cdot(6+7\sqrt{5})=42\sqrt{5}+245$$
Explanation
| $$ \begin{aligned}7\sqrt{5}\cdot(6+7\sqrt{5})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}42\sqrt{5}+245\end{aligned} $$ | |
| ① | $$ \color{blue}{ 7 \sqrt{5} } \cdot \left( 6 + 7 \sqrt{5}\right) = \color{blue}{ 7 \sqrt{5}} \cdot6+\color{blue}{ 7 \sqrt{5}} \cdot 7 \sqrt{5} = \\ = 42 \sqrt{5} + 245 $$ |
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