Answer
$$\frac{15}{\sqrt{5}}=3\sqrt{5}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{15}{\sqrt{5}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 15 }{\sqrt{ 5 }} \times \frac{ \color{orangered}{\sqrt{ 5 }} }{ \color{orangered}{\sqrt{ 5 }}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{15\sqrt{5}}{5} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}} \frac{ 15 \sqrt{ 5 } : \color{blue}{ 5 } }{ 5 : \color{blue}{ 5 } } \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{3\sqrt{5}}{1} \xlongequal{ } \\[1 em] & \xlongequal{ }3\sqrt{5}\end{aligned} $$ | |
| ① | Multiply both top and bottom by $ \color{orangered}{ \sqrt{ 5 }}$. |
| ② | In denominator we have $ \sqrt{ 5 } \cdot \sqrt{ 5 } = 5 $. |
| ③ | Divide both the top and bottom numbers by $ \color{blue}{ 5 }$. |
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