[tex] \sqrt[4]{80} = \sqrt[4]{16 \cdot 5} = \sqrt[4]{16} \cdot \sqrt[4]{5} = 2\sqrt[4]{5} [/tex]
[tex] \sqrt[3]{432} = \sqrt[3]{216 \cdot 2} = \sqrt[3]{216} \cdot \sqrt[3]{2} = 6\sqrt[3]{2} [/tex]
[tex] \sqrt[3]{54y^{8}} = \sqrt[3]{27 \cdot 2y^{6} } = 3\sqrt[3]{2y^{6}} = 3y^{2}\sqrt[3]{2} [/tex]
[tex] \sqrt[4]{80} = \sqrt[4]{16 \cdot 5} = \sqrt[4]{16} \cdot \sqrt[4]{5} = 2\sqrt[4]{5} [/tex]
[tex] \sqrt[3]{432} = \sqrt[3]{216 \cdot 2} = \sqrt[3]{216} \cdot \sqrt[3]{2} = 6\sqrt[3]{2} [/tex]
[tex] \sqrt[3]{54y^{8}} = \sqrt[3]{27 \cdot 2y^{6} } = 3\sqrt[3]{2y^{6}} = 3y^{2}\sqrt[3]{2} [/tex]