Nilai dari 7√8 - ( √3 + 2 √ 6 ) ( 3√3 - √6 )

[tex]7 \sqrt{8} - ( \sqrt{3} - 2 \sqrt{6} )(3 \sqrt{3} - \sqrt{6} ) \\ = 7 \sqrt{8} - (3.3 - \sqrt{3.6} - 6 \sqrt{6.3} + 2.6) \\ = 7 \sqrt{8} - (9 + 12 - \sqrt{18} - 6 \sqrt{18} ) \\ = 7 \sqrt{8} - (21 - 7.3 \sqrt{2} ) \\ = 7 \sqrt{8} - 21 + 21 \sqrt{2} \\ = 14 \sqrt{2} - 21 + 21 \sqrt{2} \\ = 35 \sqrt{2 } - 21 \\ = 7(5 \sqrt{2} - 3)[/tex]