1- Simplifique os radicais: a) sqrt [8](3^6)= b) sqrt [3](64)=underline ( ) e) sqrt [15](x^5)=underline ( ) f) sqrt (18)=underline ( ) i) sqrt [3](81)=underline ( ) j) sqrt [4]((16y^4)/(81))=

a) $$\sqrt [8]{3^{6}} = \sqrt [8]{729} = 3$$

b) $$\sqrt [3]{64} = 4$$

e) $$\sqrt [15]{x^{5}} = x^{5/15} = x^{1/3}$$

f) $$\sqrt {18} = \sqrt {9 \cdot 2} = 3\sqrt {2}$$

i) $$\sqrt [3]{81} = \sqrt [3]{3^4} = 3\sqrt [3]{3}$$

j) $$\sqrt [4]{\frac {16y^{4}}{81}} = \frac {2y}{3}$$