Question
Answer
$$-\sqrt{5}\cdot(5+\sqrt{2})=-5\sqrt{5}-\sqrt{10}$$
Explanation
| $$ \begin{aligned}-\sqrt{5}\cdot(5+\sqrt{2})& \xlongequal{ }-(5\sqrt{5}+\sqrt{10}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5\sqrt{5}-\sqrt{10}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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