Question
Answer
$$-4\sqrt{10}(2\sqrt{2}+5)=-16\sqrt{5}-20\sqrt{10}$$
Explanation
| $$ \begin{aligned}-4\sqrt{10}(2\sqrt{2}+5)& \xlongequal{ }-(16\sqrt{5}+20\sqrt{10}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-16\sqrt{5}-20\sqrt{10}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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