Question
Answer
$$-\sqrt{6}\cdot(10+\sqrt{21})=-10\sqrt{6}-3\sqrt{14}$$
Explanation
| $$ \begin{aligned}-\sqrt{6}\cdot(10+\sqrt{21})& \xlongequal{ }-(10\sqrt{6}+3\sqrt{14}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-10\sqrt{6}-3\sqrt{14}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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