Question
Answer
$$\sqrt{2}\cdot(-9+\sqrt{7})=-9\sqrt{2}+\sqrt{14}$$
Explanation
| $$ \begin{aligned}\sqrt{2}\cdot(-9+\sqrt{7})& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-9\sqrt{2}+\sqrt{14}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{2} } \cdot \left( -9 + \sqrt{7}\right) = \color{blue}{ \sqrt{2}} \cdot-9+\color{blue}{ \sqrt{2}} \cdot \sqrt{7} = \\ = - 9 \sqrt{2} + \sqrt{14} $$ |
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