Question
Answer
$$-\sqrt{35}\cdot(6+9\sqrt{35})=-6\sqrt{35}-315$$
Explanation
| $$ \begin{aligned}-\sqrt{35}\cdot(6+9\sqrt{35})& \xlongequal{ }-(6\sqrt{35}+315) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-6\sqrt{35}-315\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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