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