Answer :

[tex]\frac{\sqrt3}{-\sqrt{21}}=-\sqrt\frac{3}{21}=-\sqrt\frac{1}{7}=-\frac{\sqrt1}{\sqrt7}=-\frac{1}{\sqrt7}=-\frac{1}{\sqrt7}\times\frac{\sqrt7}{\sqrt7}=-\frac{\sqrt7}{7}[/tex]
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konrad509
[tex]\frac{\sqrt3}{-\sqrt21}=\\ -\frac{\sqrt{63}}{21}=\\ -\frac{3\sqrt7}{21}=\\ -\frac{\sqrt7}{7}[/tex]

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