tolong di jawab soalnya mau dikumpul besok

[tex] \sqrt{5 } = 0 - 1 = -1 \\ \\ \frac{4}{ - 1} = - 4 \\ maaf \: kalo \: salah[/tex]

[tex] \frac{4}{ \sqrt{5} - 1} \times \frac{ \sqrt{5} + 1 }{ \sqrt{5} + 1} \\ = \frac{4( \sqrt{5} + 1)}{5 - 1} \\ = \frac{4( \sqrt{5} + 1)}{4 } \\ = \sqrt{5} + 1[/tex]
semoga membantu......