Question
Answer
$$-3\sqrt{15}\cdot(5+10\sqrt{15})=-15\sqrt{15}-450$$
Explanation
| $$ \begin{aligned}-3\sqrt{15}\cdot(5+10\sqrt{15})& \xlongequal{ }-(15\sqrt{15}+450) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-15\sqrt{15}-450\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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