tolong donk nomor 8 yang b sama nomor 9

8) b.  [tex] 5^{ \frac{3}{4} } = \sqrt[4]{ 5^{3} } [/tex]

9) 
[tex] \frac{4}{( \sqrt{5} - \sqrt{3} } \\ \\ = \frac{4}{( \sqrt{5} - \sqrt{3} } x \frac{ \sqrt{5}+ \sqrt{3} }{ \sqrt{5}+ \sqrt{3} } \\ \\ = \frac{4.( \sqrt{5}+ \sqrt{3} }{5 - 3} \\ \\ = \frac{4.( \sqrt{5}+ \sqrt{3} }{2} \\ \\ = 2.( \sqrt{5}+ \sqrt{3})[/tex]