Question

$\sqrt{20}$

Answer 1

Fatorando o 20:

20 | 2
10 | 2
5   | 5
1           ⇒ 2² * 5


$\sqrt{20} = \sqrt{2^2*5} = 2\sqrt{5}$

Answer 2

\/20 = \/(4x5) = \/4 x \/5 = 2\/5
ou
\/20 = \/2 x \/10 ~ 1,41 x 3,16 ~ 4,4556