tolong bantu jawab ya guys.. makasiii

[tex] \frac{4}{ \sqrt{2} - \sqrt{3} } = \frac{4}{ \sqrt{2} - \sqrt{3} } \times \frac{ \sqrt{2} + \sqrt{3} }{ \sqrt{2} + \sqrt{3} } \\ = \frac{4( \sqrt{2} + \sqrt{3}) }{ (\sqrt{2}) {}^{2} - (\sqrt{3}) {}^{2} } \\ = \frac{4( \sqrt{2} + \sqrt{3}) }{2 - 3} \\ = \frac{4( \sqrt{2} + \sqrt{3}) }{ - 1} \\ = - 4( \sqrt{2} + \sqrt{3} )[/tex]