Answer
$$\frac{5-15\sqrt{5}}{15}=\frac{1-3\sqrt{5}}{3}$$
Explanation
| $$ \begin{aligned}\frac{5-15\sqrt{5}}{15}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{1-3\sqrt{5}}{3}\end{aligned} $$ | |
| ① | Divide both numerator and denominator by 5. |
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