i need help with folowing (a)$\displaystyle \frac{\sqrt{27}}{{5-{\sqrt{3}}}}$ (b)$\displaystyle \frac{{2}\sqrt{7}{-5}}{{7}\sqrt{3}{-4}}$ many thanks
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(a) $\displaystyle \frac{\sqrt{27}}{5-\sqrt{3}} = \frac{\sqrt{27}}{5-\sqrt{3}}\cdot \frac{5+\sqrt{3}}{5+\sqrt{3}}= \frac{5\sqrt{27}+\sqrt{81}}{22}$ Do the other one likewise.
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