bantu jawab ya kak no 15

[tex] \frac{4}{ 2 + \sqrt {3} } \times \frac{2 - \sqrt{3} }{2 - \sqrt{3} } \\ = \frac{8 - 4 \sqrt{3} }{4 - 3} \\ = 8 - 4 \sqrt{3} [/tex]