hasil dari [tex](2 \sqrt{3} + \sqrt{6} )(2 \sqrt{3} - \sqrt{6} )[/tex]

[tex](2 \sqrt{3} + \sqrt{6} )(2 \sqrt{3} - \sqrt{6} ) \\ = ( 2 \times 2) \sqrt{3 \times 3} - 2 \sqrt{3 \times 6} + 2 \sqrt{6 \times 3} - \sqrt{6 \times 6} \\ = 4 \sqrt{9} - 2 \sqrt{18} + 2 \sqrt{18} - \sqrt{36} \\ = (4 \times 3) - 6 \\ = 12 - 6 \\ = 6[/tex]
Semoga dapat dipahami