tolong dijawab pake caranya

[tex] = \frac{18}{4 - \sqrt{10} } \times \frac{4 + \sqrt{10} }{4 + \sqrt{10} } \\ = \frac{72 + 18 \sqrt{10} }{16 - 10} \\ = \frac{72 + 18 \sqrt{10} }{6} \\ = 12 + 3 \sqrt{10} [/tex]
Jawaban D

18 / (4-√10) x (4+√10)/(4+√10)
=18(4+√10) / (16-10)
=(72+18√10)/6=12+3√10