Question
Answer
$$-\sqrt{10}\cdot(-9-\sqrt{3})=9\sqrt{10}+\sqrt{30}$$
Explanation
| $$ \begin{aligned}-\sqrt{10}\cdot(-9-\sqrt{3})& \xlongequal{ }-(-9\sqrt{10}-\sqrt{30}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9\sqrt{10}+\sqrt{30}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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