[tex] \frac{1}{9} \sqrt{81a} - \sqrt{121a} = \frac{9\sqrt{a}}{9} - 11\sqrt{a} = \sqrt{a} - 11\sqrt{a} = - 10\sqrt{a}[/tex]
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[tex] \frac{1}{9} \sqrt{81a} - \sqrt{121a} = \frac{9\sqrt{a}}{9} - 11\sqrt{a} = \sqrt{a} - 11\sqrt{a} = - 10\sqrt{a}[/tex]