Question
Answer
$$\dfrac{2}{4}-\dfrac{\sqrt{21}}{14}=\dfrac{7-\sqrt{21}}{14}$$
Explanation
| $$ \begin{aligned}\frac{2}{4}-\frac{\sqrt{21}}{14}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{7-\sqrt{21}}{14}\end{aligned} $$ | |
| ① | $$ \frac{2}{4}-\frac{\sqrt{21}}{14}
= \frac{1}{2} \cdot \color{blue}{\frac{ 14 }{ 14}} - \frac{\sqrt{21}}{14} \cdot \color{blue}{\frac{ 1 }{ 1}}
= \frac{7-\sqrt{21}}{14} $$ |
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