Answer
$$\frac{7}{\sqrt{19}}=\frac{7\sqrt{19}}{19}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{7}{\sqrt{19}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 7 }{\sqrt{ 19 }} \times \frac{ \color{orangered}{\sqrt{ 19 }} }{ \color{orangered}{\sqrt{ 19 }}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\frac{7\sqrt{19}}{19}\end{aligned} $$ | |
| ① | Multiply both top and bottom by $ \color{orangered}{ \sqrt{ 19 }}$. |
| ② | In denominator we have $ \sqrt{ 19 } \cdot \sqrt{ 19 } = 19 $. |
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