Question

simplifique os radicais:

$\sqrt{45}$

$\sqrt[3]{81}$

Answer 1

$\boxed{ \sqrt{45} = \sqrt{9.5} = \sqrt{9}. \sqrt{5}=3 \sqrt{5} }\\ \\ \boxed{ \sqrt[3]{81}= \sqrt[3]{3^3.3}= \sqrt[3]{3^3} . \sqrt[3]{} =3 \sqrt[3]{3} }$

Answer 2

$\boxed{ \sqrt{45} = \sqrt{3^2*5} = 3 \sqrt{5} }$

$\boxed{ \sqrt[3]{81} = \sqrt[3]{3^3*3} = 3\sqrt[3]{3} }$

Espero ter ajudado. :))