cara nomor 3 dan 4 bagaimana mengerjakan ya?

[tex] \frac{3 + \sqrt{7} }{3 - \sqrt{7} } \\ = \frac{(3 + \sqrt{7}) }{(3 - \sqrt{7})} \frac{(3 + \sqrt{7} )}{(3 + \sqrt{7} )} \\ = ( \frac{9 + 3 \sqrt{7} + 3 \sqrt{7} + 7}{9 + 3 \sqrt{7} - 3 \sqrt{7} - (7)} ) \\ = ( \frac{16 + 6 \sqrt{7} }{9 - 7} ) \\ = ( \frac{16 + 6 \sqrt{7} }{2} ) \\ = 8 + 3 \sqrt{7} \: \:[/tex]
My answer is opsi A