tolong d jawab, sertakan penjelasannya

[tex] \frac{12}{4 - \sqrt{10} } = \frac{12}{4 - \sqrt{10} } \times \frac{4 + \sqrt{10} }{4 + \sqrt{10} } \\ = \frac{12(4 + \sqrt{10)} }{(4)^{2} - ( \sqrt{10)} ^{2} } \\ = \frac{12(4 + \sqrt{10)} }{16 - 10} \\ = \frac{12(4 + \sqrt{10)} }{6} \\ = 2(4 + \sqrt{10)} \\ = 8 + 2 \sqrt{10} [/tex]