Tolong Pke cara??????????

[tex] \frac{3}{ 2 \sqrt{5} - 1} \times \frac{2 \sqrt{5} + 1 }{2 \sqrt{5} + 1} = \frac{6 \sqrt{5} + 3} {4(5) - 1} = \frac{6 \sqrt{5 } + 3}{20 - 1} = \frac{6 \sqrt{5} + 3}{19} [/tex]
jawabannya a