[tex]a = ( - \sqrt{12} )( \sqrt{216} \div 3 \sqrt{3} + \sqrt{384} \div \sqrt{48} )[/tex]
[tex]a = ( - 2\sqrt{3} )(6 \sqrt{6} \div 3 \sqrt{3} + \sqrt{384 \div 48} )[/tex]
[tex]a = ( - 2 \sqrt{3} )(2 \sqrt{2} + 2 \sqrt{2} )[/tex]
[tex]a = ( - 2 \sqrt{3} ) \times 4 \sqrt{2} [/tex]
[tex]a = - 8 \sqrt{6} [/tex]
[tex]a = - 19.59.....[/tex]
[tex] = > B) - 20 \: si \: - 19[/tex]
