Answer
$$\frac{-9}{\sqrt{10}}=-\frac{9\sqrt{10}}{10}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\frac{-9}{\sqrt{10}}& \xlongequal{ }-\frac{9}{\sqrt{10}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}- \, \frac{ 9 }{\sqrt{ 10 }} \times \frac{ \color{orangered}{\sqrt{ 10 }} }{ \color{orangered}{\sqrt{ 10 }}} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-\frac{9\sqrt{10}}{10}\end{aligned} $$ | |
| ① | Multiply both top and bottom by $ \color{orangered}{ \sqrt{ 10 }}$. |
| ② | In denominator we have $ \sqrt{ 10 } \cdot \sqrt{ 10 } = 10 $. |
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