Question
Answer
$$-2\sqrt{15}(-3\sqrt{3}+3\sqrt{5})=18\sqrt{5}-30\sqrt{3}$$
Explanation
| $$ \begin{aligned}-2\sqrt{15}(-3\sqrt{3}+3\sqrt{5})& \xlongequal{ }-(-18\sqrt{5}+30\sqrt{3}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}18\sqrt{5}-30\sqrt{3}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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