Nomer 18 Pakai cara

[tex] \frac{6}{ \sqrt{8} - 3} = \frac{6}{ \sqrt{8} - 3} \times \frac{ \sqrt{8} + 3 }{ \sqrt{8} + 3} = \frac{6 \sqrt{8} + 18 }{8 + 3 \sqrt{8} - 3 \sqrt{8} - 9} = \frac{6 \sqrt{8} + 18 }{8 - 9} = \frac{6 \sqrt{8} + 18}{ - 1} = 6 \sqrt{8} + 18 \times ( - 1) = 6 \sqrt{8} - 18[/tex]
Jawabannya B