Question
Answer
$$-7\sqrt{10}\cdot(6-\sqrt{15})=-42\sqrt{10}+35\sqrt{6}$$
Explanation
| $$ \begin{aligned}-7\sqrt{10}\cdot(6-\sqrt{15})& \xlongequal{ }-(42\sqrt{10}-35\sqrt{6}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-42\sqrt{10}+35\sqrt{6}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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