All the questions till q7 
Please answer fast

$$\begin{gathered} 5. \mathrm{Find} \mathrm{the} \mathrm{value} \mathrm{of} \mathrm{a} \mathrm{and} \mathrm{b}:- \\ \mathrm{a}. \frac{5+2\sqrt{3}}{7+4\sqrt{3}}=\mathrm{a}+\mathrm{b}\sqrt{3} \\ b. \frac{5+\sqrt{6}}{5-\sqrt{6}}=\mathrm{a}+\mathrm{b}\sqrt{6} \\ 6. \mathrm{If} \mathrm{x}=2+\sqrt{3} , \mathrm{find} {\mathrm{x}}^2+\frac{1}{{\mathrm{x}}^2} \\ 7. \mathrm{If} \mathrm{x}=3+2\sqrt{2}, \mathrm{find} \sqrt{\mathrm{x}}+\frac{1}{\sqrt{\mathrm{x}}}. \end{gathered}$$