[tex]a)\ \ \sqrt{125}=\sqrt{25\cdot5}=\sqrt{25}\cdot\sqrt{5}=5\sqrt{5}\\\\b)\ \ \sqrt[3]{16}=\sqrt[3]{8\cdot2}=\sqrt[3]{8}\cdot\sqrt[3]{2}=2\sqrt[3]{2}\\\\c)\ \ \sqrt[3]{81}=\sqrt[3]{27\cdot3}=\sqrt[3]{27}\cdot\sqrt[3]{3}=3\sqrt[3]{3}\\\\d)\ \ \sqrt{72}=\sqrt{36\cdot2}=\sqrt{36}\cdot\sqrt{2}=6\sqrt{2}[/tex]
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[tex]a)\ \ \sqrt{125}=\sqrt{25\cdot5}=\sqrt{25}\cdot\sqrt{5}=5\sqrt{5}\\\\b)\ \ \sqrt[3]{16}=\sqrt[3]{8\cdot2}=\sqrt[3]{8}\cdot\sqrt[3]{2}=2\sqrt[3]{2}\\\\c)\ \ \sqrt[3]{81}=\sqrt[3]{27\cdot3}=\sqrt[3]{27}\cdot\sqrt[3]{3}=3\sqrt[3]{3}\\\\d)\ \ \sqrt{72}=\sqrt{36\cdot2}=\sqrt{36}\cdot\sqrt{2}=6\sqrt{2}[/tex]