Question

a soma de raiz de 80 + raiz de 20 é igual a :

Answer 1

$80 |2\\ 40 |2\\ 20 |2 \\ 10 |2\\ 5 |5 \\ 1\\ 80= \sqrt{2^2\times2^2\times5} \\ 80= 4 \sqrt{5}$

$20|2\\ 10|2\\ 5|5\\ 1 \\ 20= \sqrt{2^2\times5}\\ 20= 2 \sqrt{5}$

$\sqrt{80}+ \sqrt{20}= 4 \sqrt{5} +2 \sqrt{5}=6 \sqrt{5}$

Answer 2

$\sqrt{80} = \sqrt{ 2^{4} .5}$
$\sqrt{20} = \sqrt{ 2^{2} .5}$
$\sqrt{80} + \sqrt{20} =$$2^{2} \sqrt{5} +2 \sqrt{5}$
=$6 \sqrt{5}$