tolong di jawab dengan caranya

[tex] = \frac{12}{ \sqrt{7} + \sqrt{3} } \times \frac{ \sqrt{7} - \sqrt{3} }{ \sqrt{7} - \sqrt{3} } \\ = \frac{12 \sqrt{7} - 12 \sqrt{3} }{7 - 3} \\ = \frac{12 \sqrt{7} - 12 \sqrt{3} }{4} \\ = 3 \sqrt{7} - 3 \sqrt{3} \\ = 3( \sqrt{7} - \sqrt{3} )[/tex]
Jawaban D

3 nya positif ya.... selamat pagi