(3√2 + √6)(3√2 - √6)

(3√2 + √6)(3√2 - √6)
=9×2 - 3√12+3√12+6
=18+6
=24

[tex](3 \sqrt[]{2} + \sqrt{6} )(3 \sqrt{2} - \sqrt{6} )[/tex]
[tex] = (9 \sqrt{4} - 3 \sqrt{12} + 3 \sqrt{12} - 6)[/tex]
[tex] = (9(2) - 0 - 6) \\ = 18 - 6 \\ = 12[/tex]