Answer:
[tex]\frac{7\sqrt{6}}{2}[/tex]
Step-by-step explanation:
To rationalize the denominator, all you have to do is multiply the top and bottom by √6:
[tex]\frac{21}{\sqrt{6}}\cdot\frac{\sqrt{6}}{\sqrt{6}} = \frac{21\sqrt{6}}{6}[/tex]
You can further simplify by dividing the top and bottom by 3:
[tex]\frac{7\sqrt{6}}{2}[/tex]
I hope this helped.
